Product Catalog TEM

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Interface between optics and electronics

Product

Catalog

Interface between optics and electronics


about us

TEM Messtechnik - The Company

Founded in 1988 by Dr. Thomas Müller-Wirts, TEM

Messtechnik right from the beginning aimed at the

development of special solutions in the field of control

and measurement techniques. The field of activities

includes optics, electronics as well as chemistry and

medicine. A handful of the customer-specific solutions

has even matured to universal, self-contained

products. The latter are presented in this catalog, thus

giving an outline of our activities.

If you are interested in any field related to the listed

devices please do not hesitate to ask us for detailed

information, for adaptations or even new developments.

You will be impressed by our flexibility!

Address

TEM Messtechnik GmbH

Grosser Hillen 38

30559 Hannover

Germany

tel. +49-511-51089630

fax +49-511-51089638

info@tem-messtechnik.de

www.tem-messtechnik.de


Laser

Electronics

Optical

Measuring

Technique

Control

Engineering

Fields of Activity

scan generators, high voltage piezo amplifiers,

temperature controllers, diode laser divers, laser

diode modulators, precision wavelength stepping,

linearized scans, USB programmable all-in-one

systems, customer specific solutions

interferometric and atomic frequency references

for tunable lasers, single-mode and mode-hop

detectors for tunable lasers, position/polarization

sensitive detectors, lock-in detection, HF

modulation techniques, laser linewidth measurement

tools

precision frequency regulators for fixed or

scanning frequency lasers, laser amplitude/power

stabilisation with AOM or EOM, laser beam

position/pointing stabilisation, automatic singlemode

fiber coupler, multidimensional control of

tuning elements

about us

Development

Service

customer specific adaption of our standard

products, development of electronic devices,

analogue and digital solutions, OEM boards,

modular systems or stand-alone devices: from the

first idea to the production-ready solution

Scientific

Consultation

high competence consultation in the fields of

tunable lasers, interferometry, laser distance

measurement, spectroscopy, sensor electronics,

laser driver and stabilisation electronics, power

supplies, close relationship to universities and

research institutions


Content

Aligna

Automated laser beam

alignment and stabilization

system

µAligna

Compact form of

automated laser beam

alignment and stabilization

system

µAligna Motor Control

High-precision motor

control electronics

µAligna Crosshair

Ultra-high precision electronic

crosshair


FiberLock

Automatic single mode

fiber coupling

Digital LaseLock

Fully digital stand-alone

laser stabilization

electronics

Content

iScan

The instrument for fast

and precise control of

tunable laser sources

CoSy

Compact unit for

absorption saturation

spectroscopy


Content

PhaseLock

Universal and compact

phase stabilization

electronics

NoiseEater

The universal laser intensity

stabilization

miniScan

Scan generators -

for scanning Fabry-Perot

Interferometers and other

applications

PulsePicker

Repetition rate reduction

system


PDA-S

Universal, sensitive

transimpedance amplifier for

photo diodes

miniPiA

The compact piezo amplifier

Content

miniSupply

Universal symmetric DC

power supply


Aligna ®

®

Aligna

Automated Laser Beam Alignment and

Stabilization System

- fully automated high precision beam alignment

- self learning parameter settings

- modular system, control of up to 4 beams, all wavelengths

- 2D and 4D scanning (position X,Y, angle X,Y)

Applications

• High precision material processing

• Compensation of drifts and air fluctuations

• Compensation of disturbance by moved optical components

(Delay Lines, Tuning Elements, Zoom Optics,...)

• Switching of one laser between several applications

• Multi-dim scans for characterization of optical setups

• Automatic coupling / optimization to single-mode fibers

or to High Harmonic Generation Capillaries

• Complete auto-alignment after laser replacement

• Laser / experiment at different optical tables or rooms

• Trepanning Optics: Compensation of laser drifts

www.TEM-Messtechnik.de


Principle of Operation

Aligna ®

Laser beams, used in an experiment or in industrial applications, can move

in space for many reasons:

1: thermal drifts

inside the laser,

movements by

frequency detuning,

by power variation, etc.

Laser

Cooling System

2: thermal drifts

of cooling system

and mechanical laser

mounts

6: moved optical elements

(delay lines, switching mirrors,

motorized telescopes,...)

5: thermal effects in

optical elements and

mirrors

Target

3: drifts of alignment

and folding mirror

holders

4: air fluctuations and

temperature gradients

7: Movement of the experimental

(optical) tables or vacuum chambers

• cw and pulsed lasers: rep rate 0.1 Hz ... 200 MHz / cw

• modular system, up to 4 beams controlled by one device

• servo loop accuracy: < 1 µm, < 1 µrad (down to 10 ... 100 nm)*

• very large scan range: > 18° ***

• all wavelengths (with standard detectors: 380 ... 1100 nm,

with special detectors 180 nm ... 10 µm, even THz), any beam diameter

• high speed: up to 5 kHz servo bandwidth**

• several combinations of motorized and piezo-driven actors

• fully computer control (USB, serial, Ethernet) and fully autarkic operation

• connection of external measurement devices (power meters, PDs, ...)

* with "OneInch" piezo actors

** with "OneInch" piezo actors, small mirrors

*** with motorized mirror mounts "Aligna 40”

PSD 4D e:

Position Sensitive Detector 4D:

Position X,Y, Angle X,Y

Visualization and Control System

- logging of pointing and power

- several beams simultaneously

- automatic learning of opto-mech setup


Applications

High Precision Material Processing

Auto-Alignment System:

NO manual alignment necessary!

Two motorized and piezo-based mirrors,

4D pointing measurement

Aligna ®

®

Aligna R:

Rotation stage for

polarization control,

intensity stabilization

®

Aligna multiDrill:

AutoFocus and

Pointing Stabilizer Head

One laser distributed to several

high precision applications:

compensation of laser drifts, mechanical drifts,

air fluctuations, vibrations,residual

position error of switching mirrors

®

Aligna StabBoxx:

Compact All-In-One

Laser Beam Stabilizer:

4D beam control by two motorized

and piezo-based actuators

4D pointing measurement

for pointing servo control

very easy integration into

existing setups


Modular System: Electronic Components

Aligna ®

®

Aligna 4D: 19" Rack Control Electronics

- modular system: up to 4 independent control

modules, 4 beams (4 SPM modules)

- µController 32 bit, interfaces: USB, Serial, (Ethernet opt.)

- LCD menu user guidance, user-definable keys

- Software package for visualization and PC control

- Supply for motor-driven and piezo-based actuators

(up to 24 piezo actors, up to 8 motors, up to 16 loads)

®

Aligna 4D

SPM: Signal Processing Plug-In Module

- for connection of one PSD 4D, two PSD 2D, or other measurement

heads (power meters, photo diodes, temperature, ...)

SPM-P: Add-on to SPM, for use of Piezo Servos

- including four fast servos for piezo actuators (or AOM scanner)

- µC-controlled state variable filters for compensation of piezo resonances

SPM-SH: Add-on to SPM, for use of Slow-RepRate Pulsed Lasers

- Sample&Hold / Mixing circuitry, incl. pulse signal normalization

- repetition rates: 0.1 Hz ... 30 kHz (>30 kHz: no SPM-SH needed)

SPM-ADDA: Signal Processing Plug-In Module for external devices

- for additional analog and digital inputs and outputs

- input signals from power meter heads, photo diodes, temperature sensors

- output signals to shutters, external devices, control systems

- 8 analog inputs (+/- 10 Volts), 8 analog outputs (+/- 10 Volts), 8 TTL I/O

PiezoDriver: Piezo Actor Driver Module

- eight (max. 12) piezo-based actors (4 x "OneInch", e.g.) per module

- 0...150 V, 50 mA standard (0...95V, 0...500 V,... on demand)

µStp Driver: Micro Stepping Driver Module

- including 8 power amplifiers, each 1 A max

- four motorized linear actors (or micro-stepping motors)

2x Aligna40 or Aligna60, e.g.,

or 4x AlignaLin or other (std. or microstepping) motors

- other loads, like peltier coolers (TEC), relays, shutters, diode lasers

Aligna IO: Digital IO for communication with SPS, PLC (or other control systems)

- used for status, error, station control

- LEDs for indication of all input/output levels

- standard SUB-D 25 (female) connector

- 4 (6, 8) opto-coupled inputs (TTL compatible, 0...24V, voltage/current)

- 4 (6, 8) relay-coupled outputs (complete galvanic de-coupling, 0.5A max.)

alternatively 4 (6,8) FET outputs

Aligna Con: BNC Connection Box for analog or digital signals

- used for access to all relevant analog input/output signals

(PSDs, motors, piezo actors, control signals, TEC, shutter, user-spec. components)

- for use with ext. control systems (oscilloscope, DACS,...)

- 8 BNC connectors, HD15 male, HD15 female

Kangoo: Comprehensive Control Program

- visualization of pointing, intensity, servo, etc.

- logging of pointing, intensity, etc. vs. time

- 2D or 4D scanning and measurement

- self learning algorithms to optimize parameters for

best fitting to the opto-mechanical setup,

including all kinds of optical elements

- compatible to Windows 7, Vista, XP, 2k, 9x


Modular System: Opto-Mechanical Components

PSD 4D i: Position Sensitive Detector "industrial"

- 4D measurement of position X,Y and angle X,Y

- cw and pulsed lasers

(test beam pow. cw: 100 µW...10 mW, pulsed: >10 nJ)

- high accuracy: < 1 µm, < 1 µrad

PSD 4D e: Position Sensitive Detector "experimental"

- like "PSD 4D i", but discrete components

- can be easily adapted to experimental setup

or to even higher accuracy: < 10 nm, < 10 nrad

PSD 2D: Position Sensitive Detector 2D (cw or pulsed)

- individual use, or combined for 4D detection

- std. wavelength: 380...1100nm

special versions 180 nm...2600 nm

Aligna 40: Motorized Mirror Mount 40x40 mm

- two ultra microstepping linear actors

- manual actuation by knurled knobs

- reference optical encoder for both axes

- several fixing methods for mirrors (or other components)

(1", 1/2", 2", and others, any thickness)

Aligna60

PSD4D e

PSD2D

PSD4D i

Aligna ®

Aligna 60: Motorized Mirror Mount 60x60 mm

- same as Aligna 40, larger size, preferred for 2" mirrors)

Aligna MoPiA 40: Motorized + Piezo Actors

- compact combination of Aligna 40

and BeamScan OneInch

Aligna40

MoPiA40

Aligna Lin: Motorized Linear Stage

- application: auto-focussing optics

- linear travel: 7 mm (more on demand)

- various adapters for optical components

- 1" lenses or other components

- M9x0.5 mm objectives (and others)

- optical reference pos. detection

BeamScan OneInch: Piezo-based XY scanner

- 1.25 mrad, max. 1.5 kHz

- fitting to standard 1" mirror mounts

AlignaLin

w. SM fiber

collimator

AlignaLin

1 inch lens

BeamScan HS: Piezo XY scanner with high stroke

- for auto-coupling to Single-Mode Fibers

- high stroke: up to 2x100 mrad, 0.5 kHz

- opt: man. or motorized focussing for SM fibers

BeamScan OneInch

BeamScan HS

BeamSwitch DC: Beam Switch and Shutter

- Precision beam switch, double ball bearings, adjustable limits

- feedback signal (optical encoder) for valid action in both positions

- beam diameter < 10 mm, beam dump or high reflecting mirror

- no heat dissipation in both positions (current pulse control)

BeamSwitch DC


Technical Data

Aligna ®

Dimensions:

control electronics in 19-rack

Aligna40 motorized mirror mount

Aligna60 motorized mirror mount

PSD4Di:

PSD4De:

Interfaces:

protocol:

®

Aligna Control Unit

µC:

Electrical supply:

Power consumption:

484 x 343 x 150 mm

40 x 40 x 63 mm

60 x 60 x 63 mm

100 x 147 x 47 mm

200 x 110 x 60 mm

USB, RS232 serial, (Ethernet optional)

clear text ASCII commands, internal script language

including visualization and measurement software

incl. user-spec .adaptations, LabView VIs available

32 Bit MC68332

100...120/200..250 VAC, 50/60 Hz (24V DC opt.)

< 97 W (72 W typ.)

Servo bandwidth (4D):

Number of calculation modules:

Number of piezo amplifier modules:

Number of motor driver modules:

Output voltage of piezo amps:

selectable, 0.1 Hz...20 kHz

1 to 4 (up to 8 PSD2D or 4 PSD4D)

1 or 2 (8 ... 24 HV channels)

1 or 2 (2 to 4 mictrostepping motors/actuators)

std: 0...150 V, active limitation (0..500V, 0..95 V opt.)

Subject to change without notice

10/2013


®

μAligna

Automated Laser Beam Alignment and

Stabilization System

- fully automated high-precision beam alignment

- self-learning parameter settings

- modular system, control of up to 2 beams, all wavelengths

- 2D and 4D scanning (position X,Y and angle X,Y)

- very compact form factor

Applications

- high precision material processing

- compensation of thermal drifts

- compensation of disturbance by moved optical components

(delay lines, tuning elements, zoom optics, ...)

- switching one laser between several applications

- multi-dim scans for characterization of optical setups

- automatic coupling / optimization to single-mode fibers

or to High Harmonic Generation Capillaries

- complete auto-alignment after laser replacement

- parallelization of laser beams to moving axes

µAligna

www.TEM-Messtechnik.de


Principle of Operation

Laser beams, used in an experiment or in industrial applications, can move

in space for many reasons:

µAligna

1: thermal drifts

inside the laser,

movements by

frequency detuning,

by power variation, etc.

Laser

Cooling System

2: thermal drifts

of cooling system

and mechanical laser

mounts

3: drifts of alignment

and folding mirror

holders

4: air fluctuations and

temperature gradients

6: moved optical elements

(delay lines, switching mirrors,

motorized telescopes,...)

5: thermal effects in

optical elements and

mirrors

Target

7: Movement of the experimental

(optical) tables or vacuum chambers



cw and pulsed lasers: rep. rates 5 kHz ... 200 MHz / cw

flexible system, up to two beams controlled by one device

• servo loop accuracy: < 1 µm, < 1 µrad

• all wavelengths (with standard detectors: 380 ... 1100 nm,

with special detectors 180 nm ... 10 µm, even THz), any beam diameter

• several combinations of motorized actuators and PSDs or other detectors

• full computer control via USB (serial or ethernet optional) and autarkic

operation

• connection of external measurement devices (power meters, PDs, ...)

* with motorized mirror mounts "Aligna 40”

PSD 4D e:

Position Sensitive Detector 4D:

Position X,Y, Angle X,Y

Visualization and Control System

- logging of pointing and power

- several beams simultaneously

- automatic learning of opto-mech setup


Control Electronics

μAligna: Compact Control Electronics

- μController, 8 bit

- interfaces: USB (serial, ethernet or wireless optional)

- up to eight motor driver outputs (more on request),

1.5 A max

- up to 16 input channels (±10V) for two PSD 4D

detectors or other measurement heads (power meters,

photo diodes, temperature, ...)

- up to 16 output channels (±10V)

2

- SPI and I C bus

Software

Kangoo: Comprehensive Control Program

- vizualization of all μController parameters

- logging of any value vs. time

- 2D or 4D scanning and measurement

- fully scriptable

- compatible with Windows 7, Vista, XP, 2k, 9x

- plain-text communication with the μController

for simple integration with other control software

Opto-Mechanics

µAligna

Aligna 60: Motorized Mirror Mount 60x60 mm

- two ultra microstepping linear actuators

- manual adjustment by knurled knobs

- reference optical encoder for both axes

- several fixing methods for mirrors or other

components

(1", 1/2", 2", and others, any thickness)

Aligna 40: Motorized Mirror Mount 40x40 mm

- same as Aligna 40, smaller form factor

- preferred for tight space requirements

Aligna R: Rotational Stage

- precise control of polarizing elemtents

- laser intensity stabilization

- rotations of cylindrical lenses

Aligna60

Aligna40

PSD 4D i: Position Sensitive Detector "industrial"

- 4D measurement of position X,Y and angle X,Y

- cw and pulsed lasers

(test beam pow. cw: 100 µW...10 mW, pulsed: >10 nJ)

- high accuracy: < 1 µm, < 1 µrad

Aligna R

PSD 4D e: Position Sensitive

Detector "experimental"

- like "PSD 4D i", with discrete

components

- easily adapted to any

experimental setup or to even

higher accuracies (< 10 nm,

< 10 nrad)

PSD 4D i

PSD 4D e


Technical Data

µAligna

Dimensions:

control electronics:

Aligna40 motorized mirror mount

Aligna60 motorized mirror mount

PSD-4D i:

PSD-4D e:

Interfaces:

protocol:

Aligna

µC:

Electrical supply:

Power consumption:

®

µ Control Unit

Number of input channels:

Number of motor driver outputs:

210 x 125 x 45 / 90 mm

40 x 40 x 63 mm

60 x 60 x 63 mm

100 x 147 x 47 mm

200 x 110 x 60 mm

USB, RS232 serial, (ethernet optional)

clear text ASCII commands, internal script language

including visualization and measurement software

incl. user-spec. adaptations, LabView VIs available

AVR ATmega

9 - 24V DC power Adapter, 3A

< 50W (20W typ.)

8 or 16 (up to 4 PSD-2D or 2 PSD-4D)

4 or 8 (up to 4 Aligna40 or Aligna60 actuators)

Subject to change without notice

12/2013


Motor Control

®

μAligna Motor Control

High-Precision Motor Control Electronics

- µStep drivers for controlling motorized actuators

- USB interface and PC software for remote steering and process

automation

- open software for user programming

- combination movements and motorized scanning

µAligna

Applications

• control of linear actuators for laser beam steering:

- motorized mirror mounts for 4D beam positioning

- movement of focusing optics, detectors etc.

- control of optical elements in inaccessible

locations

- automated/scripted motion control

• control of rotational actuators:

- rotations of polarizing optics, shutters etc.

- laser intensity control/modulation

www.TEM-Messtechnik.de


µAligna Motor Control

Control Electronics

μAligna: Compact Control Electronics

- μController, 8 bit

- interfaces: USB, optionally serial, ethernet or

wireless

- supports multiple motor-driven actuators (up to four

motors for the variant μAligna 004, up to eight for

the variant μAligna 008, more motors on request)

2

- SPI and I C bus

Software

Kangoo: Comprehensive Control Program

- vizualization of all μController parameters

- logging of any value vs. time

- 2D or 4D scanning and measurement

- fully scriptable

- compatible with Windows 7, Vista, XP, 2k,

9x (Linux via Wine)

- plain-text communication with the

μController for simple integration with other

control software

Opto-Mechanics

Aligna 60: Motorized Mirror Mount 60x60 mm

- two ultra microstepping linear actuators

- manual adjustment by knurled knobs

- reference optical encoder for both axes

- several fixing methods for mirrors or

other components

(1", 1/2", 2", and others, any thickness)

Aligna 40: Motorized Mirror Mount 40x40 mm

- same as Aligna 60, more compact in size

- preferred for tight space requirements

Aligna60

Aligna40


®

μAligna

Ultra-high precision electronic crosshair

- monitoring of the full 4D beam pointing

- sub-mircometer & sub-microrad precision

- comprehensive software for zoom display, measurements

and aided alignments

- all common wavelengths

- compact form factor (125 x 210 x 44 mm)

µAligna Crosshair

Applications

- replacement for mechanical crosshairs

- live display of the beam pointing

- measurement of mechanical deformations,

e.g. of rails (static and dynamic)

- measurement of thermal stabilities of the

beam pointing

- multi-dim scans for characterization of

optical setups

- software-aided alignment and parallelization

of laser beams to moving axes

www.TEM-Messtechnik.de


Basic Operation

An Electronic Crosshair

µAligna Crosshair

The uAligna-system can measure the pointing of a

laser beam to sub-micometer & sub-microrad precision.

The control software Kangoo separately displays the

measured beam position and angle. Thus, using the

uAligna Crosshair is not only significantly more precise,

but also much more convenient than a mechanical

crosshair.

Advanced Operation

Opto-Mechanics

The standard pointing detector is based on

PSDs and has the following features:

• cw and pulsed lasers: rep. rates 5 kHz ...

200 MHz / cw

• accuracy: < 1 µm, < 1 µrad

• all wavelengths (with standard detectors: 380

... 1100 nm, with special detectors 180 nm ...

10 µm, even THz), any beam diameter

• several different sizes: from very compact 2D

detectors to fully-enclosed 4D detectors

• simple power adjustment with HR mirrors or

optical filters

Software-assisted alignment and logging

! software-controllable offsets and gains help with the

alignment of optics on moving sleighs

! logging of the measured beam pointing allows to easily

and accurately determine the

straightness of moving axes or

deformations due to dynamic forces

or thermal expansion

! simple interfacing with customer

software through clear-text

commands


®

FiberLock

Automatic single-mode fiber coupling

- single-mode fiber coupling is set up within seconds

- automatic multidimensional tracking

- compensation of thermal and mechanical drifts

- easy optimization of coupling optics

- NoiseEater mode

- 3D visualtization of the coupling efficiency and intensity

logging

Principle

piezo scanner

laser

single-mode fiber

9V - 18V

input

FiberLock

photo

detector

FiberLock

power

status

lock

intensity

optional PC

www.TEM-Messtechnik.de

FiberLock

output

www.TEM-Messtechnik.de

reset

program


FiberLock

Principle of Operation

Usually, coupling into single-mode fibers is a time-consuming task since

mechanical positioning with sub-micrometer precision has to be performed.

Expensive moving or tilting units with very good long-term stability have to

be used.

With the FiberLock, the laser beam is scanned two-dimensionally by

special piezo actuators with up to kHz frequencies and by up to several

hundreds of micrometers. The light transmitted through the fiber is detected

by a photo detector and is then displayed in 'real-time' as a 3D-view on a

PC. Thus, the coupling can be monitored and optimized, e.g. by shifting or

tilting of the focussing optics. This three-dimensionally displayed coupling

profile can be viewed from any direction.

bad focus improved focus optimized focus

Lock: Once an intensity peak is found, the FiberLock can lock the piezo

scanner to the point of maximum coupling efficiency. This is done with small

circular modulations of the scanner angle and 2D lock-in regulator. While in

lock, other degrees of freedom (e.g. the focus) can be optimized “live” in a

fast and convenient way.

NoiseEater mode: In addition to locking to the maximum intensity, the

FiberLock can smooth intensity fluctuations by constantly adjusting the

quality of the fiber coupling. The circular modulation of the scanner is now

changed to follow a geodesic orbit, which cancels all intensity noise

introduced by the fiber coupling or elsewhere along the optical path.

In lock, the regulator gain and the size and

shape of the modulation circle can be

adjusted to account for different noise

environments and beam shapes. A display

for the scanner position and a chart recorder

for the intensity make these further

adjustments easy to perform.

Intensity thresholds control the LEDs on the

front of the FiberLock to allow easy operation

without a PC.


FiberLock electronics: contains all

necessary electronic components in a

compact package:

- an input amplifier with adjustable gain allows

to stabilize on a wide range of signals (0 -

10V or transimpedance input).

- a fast piezo amplifier is integrated (+/- 30V

for the standard actuator, other voltages, e.g.

0 - 150V, on request).

- a 32-bit microcontroller handles the signal

processing, including a scan generator, two

lock-in regulators, data processing for the 3D

display and USB communication.

Kangoo: comprehensive control program

- visualization of all μController parameters

- logging of intensity values vs. time

- 2D scanning and 3D data visualization

- fully scriptable

- compatible with Windows 7, Vista, XP, 2k, 9x (and Linux via wine)

- plain-text communication with the μController

for simple integration with other control software

Control Electronics

Software

FiberLock

Opto-Mechanics

BeamScan LV: standard 2D actuator

- large angle scans (~25mrad)

- medium speed (~ 1khz)

- 10 x 15mm mirror

- low voltage operation (+/- 30V)

- mounts on standard 1" or 25mm mirror mounts

BeamScan 1-inch: high-speed 2D actuator

- medium angle scans (~2mrad)

- high speed (up to ~10kHz)

- high-voltage operation (0 - 150V)

- standard 1" or 25mm mounts

- flexible mirror size

We supply a wide range of actuators for optics applications,

which are easily paired with the FiberLock electronics, and we are

happy to build custom-made designs. Please contact us for details.


FiberLock

Technical Data

Dimensions:

control electronics:

BeamScan LV piezo actuator:

Interfaces:

protocol:

FiberLock Control Unit

µC:

electrical supply:

power consumption:

number of input channels:

number of piezo driver outputs:

170 x 130 x 35 mm, for mounting on optical tables

40 x 40 x 20 mm (fits 1" mirror mounts)

mirror size: 10x15mm

USB

clear text ASCII commands, internal script language

including visualization and measurement software

incl. user-spec. adaptations, LabView VIs on request

AVR32 controller

9 - 18V DC power Adapter, 1.5A

< 30W (10W typ.)

1 (with voltage or current pre-amplifier)

2 (+/- 30V or 0 - 120V)

Subject to change without notice

10/2014


®

Digital LaseLock

Fully digital stand-alone laser stabilization electronics

! Compact, stand-alone locking electronics for diode lasers, dye lasers, Ti:Sa

lasers, or optical resonators

! Side-of-fringe and top-of-fringe stabilization

! 2 independent PID regulators

! Lock point validity detection and automatic "search" function

! Built-in oscilloscope functionality

! User interface with touch screen and colored signal display

www.TEM-Messtechnik.de

Digital LaseLock


Principle of Operation

Two different methods can be applied:

1) side-of-fringe stabilization

Digital

2) top-of-fringe stabilization

(to maximum or minimum,

'lock-in'-technique)

Side-of-fringe stabilization is used when a direct discriminator signal can be derived

from the measurement signal.

In contrast, top-of-fringe stabilization uses a modulation technique and phasesynchronous

detection. For this, the laser frequency (or a different physical measure

like the resonator length) is modulated, a detector signal is multiplied with the

modulation signal, and then the product signal is averaged by a low pass filter. The

resulting 'lock-in'-signal represents the derivative of the signal with respect to the laser

frequency (or the respective varied physical measure).

This signal can be used directly for physical examinations, because in most cases it

contains less disturbing signal parts (noise, offsets) than the directly measured signal.

The zero-crossing of the derivative represents a maximum (or minimum) of the

detected signal structure. For stabilization of a laser or resonator towards such an

extremum, the 'lock-in' signal is processed by a regulator, which generates a suitable

control signal that is fed back (either directly, or for piezo actuators via a high-voltage

amplifier) to the frequency-determining element of the laser (or resonator). In this way

the control loop is closed and the laser (or resonator) is locked actively to the maximum

(or minimum).

side-of-fringe side-of-fringe top-of-fringe

Block Diagram


Components of LaseLock ®

®

Digital LaseLock combines all components required for or beneficial to this

purpose in a user-friendly compact device:

Input section

Two separate fast input channels (2.5 MS/s)

Up to 16 additional input channels (200 kS/s)

Generation of input signal difference and/or ratio

Optional: External preamplifier with supply and remote control from the lockbox

Lock-in-amplifier section

Sine/cosine oscillator with adjustable frequency

Modulation output with adjustable amplitude

Complex phase-synchronous detection

2f / 3f demodulation, user selectable

Adjustable detection phase (0 - 360°) and filter cut-off frequency

Synchronisation input (optional)

Scan generator section

Triangular-shaped scan signal for system adjustment

Scan range equal to the regulator output span

Adjustable scan frequency and amplitude

Output section

Two high-bandwidth regulator output channels (2.5 MS/s)

Up to 16 additional output channels (200 kS/s)

LaseLock Aligna ®

PID regulator section

Two PID regulators for simultaneous control of two laser tuning elements (e.g.

grating piezo and laser current in an ECDL)

Individually adjustable proportional, integral and differential regulator coefficients

Second order low pass filter for resonance suppression in mechanical systems

Modulation input, e.g. for set point and/or output modulation

Search logic

Discriminator logic for recognition of valid and invalid regulation ranges

User-selectable action upon loss of regulator input signal: Automatic search scan /

regulator hold / reset

Monitor outputs

Analog output of relevant internal signals and levels for display on a scope screen

Drivers (optional):

HV AMP:

HC AMP:

CCTC:

Suitable sensors:

High-voltage amplifier for piezo actuators

High-current amplifier for galvo scanners

TEC/current drivers for diode lasers

CoSy : Compact saturation spectroscopy module (Rb, Cs, K cells)

Fabry-Pérot interferometer with detection after Hänsch-Couillaud (PDR-HC)

Fabry-Pérot interferometer with detection after Pound-Drever-Hall (PDH)

www.TEM-Messtechnik.de


Colored TFT touch screen

Digital

®

Laselock scans the laser frequency.

The user can search the absorption lines and

select the desired line peak for regulation using

two threshold values (red and blue line).

The built-in dither generator modulates the output

voltage. The demodulated input signal is used for

the regulation. The yellow line defines the set point

level.

After switching from “scan“ to “lock“, LaseLock

stabilizes the frequency to the desired absorption

peak. The input signal is always compared with

user defined thresholds. If the signal exseeds

these thresholds, the regulator will start a search

scan and then relock automatically.

PC interface (USB, RS232, optional: Ethernet)

Full remote control of all parameters

Read-out of measurement data

Control and visualization software Kangoo

Free LabView drivers

!

4.3" TFT touch screen with

adjustable backlight brightness

! full control of all parameters

! relevant parameters and system

status on the home screen

! graphical user interface

! visualization of signal and

parameter levelson screen

! selection wheel for parameter

setting and menu scrolling


Application Example

Stabilization of the frequency of an external cavity diode laser to an atomic absorption line

atomic reference

preamp box

scope

Y X trig

laser

HV out 1

(rear side)

piezo

input

This application requires the following components:

diode

current

control

laser driver

• one digital LaseLock®

with HV option

• one laser the frequency of which can be tuned via a piezo-actuator

(e.g., a TOPTICA DL100 diode laser)

• one spectroscopic absorption cell*

• one beam splitter

• two photo detectors

In this application, the frequency of a tunable laser (e.g., a diode laser, Ti: Sapphire- or

dye laser) is stabilised with the help of a reference cell. The aim is to regulate the laser

frequency to a value for which the sample shows maximum or minimum absorption.

*We recommend to use TEM Messtechnik´s compact spectroscopy module CoSy,

which includes a complete setup for Doppler-free saturation absorption spectroscopy.

LaseLock Aligna ®

www.TEM-Messtechnik.de


Digital LaseLock

Technical Data

Signal input Impedance 1 MOhm

Voltage range

+/- 1.0 V (fast inputs)

+/- 10.0 V (slow inputs) (others on request)

Bandwidth

300 kHz (higher BW on request)

Sampling Rate

2.5 MSps (fast inputs)

200 kSps (slow inputs)

Outputs Voltage range +/- 10.0 V at 1 kOhm load

Impedance

50 Ohm

Sampling Rate

2.5 MSps

Lock-In amplifier Modulation frequency 0.1 Hz ... 1 MHz

Phase adjustment 0 ... 360°

Cut-off frequency

25 Hz ... 850 kHz

Twin PID regulator Combinations independent / parallel / series

Over-all delay approx. 2 µs

Scan generator Output frequency 100 mHz ... 20 kHz (triangular or saw

tooth shape, TTL trigger output)

Supply Voltage range 100...240 V AC, 50...60 Hz (auto detect)

Power consumption Typ. < 10 W, (20 W with HV option,

max. 100 W @ full load)

Housing Dimensions H x W x D 88mm x 260mm x 373mm

Display Size 4.3" (11 cm)

Resolution

480 x 272, 16-bit color

Technology

resistive touchscreen, LED backlight

Subject to change without notice

11/2013


iScan

iScan ®

The interferometric frequency control for tunable lasers

The iScan is designed for research laboratories as a universal tool

for static and dynamic control of the frequency and mode properties of tunable

lasers.

! fast and precise scanning of tunable lasers

! stepping to different arbitrary wavelengths

! surveillance of the scan behaviour of tunable lasers

! Measurement of the wavelength and single-mode stability of tunable

lasers

PB A

I a

a

b

BS

PB B

FPI

I b

Quadrature Signal

Photo Detectors

laser beam to

experiment

Wedged

Beam Splitter

Fabry-Perot-

Interferometer

Normalisation

Photo Detectors

Quadrature Signals

l

Laser Wavelength

www.TEM-Messtechnik.de

TC

Temperature

Stabilisation

Patents: US 6,178,002 ; DE 197 43 493 A 1


Components of the iScan System

iScan

The iScan system consists of a

measurement head and the control

electron ics.

The iScan system is suitable for

almost any kind of tunable lasers:

diode lasers, DBR and DBF diodes,

Ti: Sapphire lasers, dye lasers...

The iScan Control Electronics evaluates the

signals of the iScan measurement head.

It optionally controls the diode laser as well

(current, power, temperature). When operated in

a closed feedback loop, the control electronics

provides a regulator signal to stabilize or tune the

laser frequency.

The measurement head

contains the interferometer

optics, photo detectors,

preamplifiers, temperature

sensing and control.

Tunable

Laser

to the experiment

FC

iScan

Measurement Head

Temperature

stabilization

Interferometer

signals

Regulator signal

for frequency stabilization

iScan

Control Electronics

USB or RS232

PC

Frequency or Scan

function preset

Key Features:

! Laser wavelength stabilization to arbitrary values within the tuning range of the

laser

! Highly accurate stabilization of the laser frequency whilst tuning, thus:

elimination of hysteresis, non-linearities, mechanical vibrations and drift

! High measurement speed with simultaneously high resolution (MHz bandwidth)

! Measurement of long-term and short-term wavelength stability without the need

to keep the laser frequency constant. (mechanical or thermal drift, jitter,

technical bandwidth)

! Comfortable tool for adjustment and optimization of the scanning laser cavity

! Available as stand-alone module or in combination with an ECDL

! Compact design


The iScan Measurement Head

The iScan system employs a patented interferometer setup with four independent

photo detectors. The detectors receive several interference signals with a phase

difference of approx. 90° (quadrature signals), allowing for monitoring of the tuning

behaviour and detection of mode hops.

PB A

I a

a

TC

PB B

b

FPI

I b

BS

Quadrature Signal

Photo Detectors

laser beam to

experiment

Wedged

Beam Splitter

Fabry-Perot-

Interferometer

Normalisation

Photo Detectors

Temperature

Stabilisation

Patents:

US 6,178,002

DE 197 43 493 A 1

Quadrature Signals

l

Laser Wavelength

iScan

Displaying the quadrature signals on a 2-channel oscilloscope in xy-mode yields

characteristic figures (Lissajous figures), which correspond to the properties of the

laser.

Single-mode-scan:

The quadrature signals

describe a circle with

fixed radius.

Mode hop:

Sudden jump across the

circle.

Multi-mode-scan:

Circle with a significantly

smaller and non-constant

radius.

The iScan processes information given in polar coordinates:

The phase corresponds to the wavelength.

The radius corresponds to the mode purity.


Technical Features

iScan

Measurement Head:

! Interferometer suitable for 380 to 1100 nm wavelength range (other wavelength

on request)

! Different Free Spectral Ranges of 2GHz to 1.5 THz available

! Entire optical setup is thermally stabilized to high precision

! FC-APC Fiber connector for coupling of arbitrary laser sources, or free beam

aperture

! OEM versions on request

Control Electronics:

! Digital interfaces: USB and/or RS232

! Arbitrary scans can be realized, including scans for accurate linear frequency

tuning of any tunable laser

! Driver and control electronics are integrated either in a desktop or 19"-rack

case.

Drivers (optional):

! High voltage amplifiers (single or multi channel)

! Current drivers for galvos

! Laser diode drivers (current and temperature control)

Additional sensors (optional):

! CoSy (compact saturation spectoscopy module) as absolute frequency /

wavelength reference

! FPI (Fabry-Pérot cavity)

! FiberEtalon (fiber-based marker etalon for extremely linear scans)

Options:

! Adaptation to tunable solid state lasers such as Alexandrite or Ti:Sapphire lasers,

tunable dye lasers and frequency-doubled systems

! Optics and detectors for communication wavelengths

! Stabilization of several lasers relative to each other possible

Literature

J. Brachmann et al.:Calibrating an interferometric laser frequency stabilization to

megahertz precision 10 August 2012 / Vol. 51, No. 23 / APPLIED OPTICS

(http://arxiv.org/pdf/1208.2375v1.pdf)

A. Deninger et al.:High-Power Dual-Color Diode Laser System with Precise

Frequency Control for CW-THz Generation.OSA, 2007

A. Deninger, et al.:Precisely tunable continuous-wave terahertz source with

interferometric frequency control. REVIEW OF SCIENTIFIC INSTRUMENTS 79,

044702 (2008)

Th. Kinder, Th. et al.:Absolute distance interferometer with grating-stabilized tunable

diode laser at 633 nm.Journal of Optics A: Vol 4 No. 6 (2002) p. S364-S368


Application Example I

Acquisition of mode stability charts

Tunable Diode

Laser

grating angle

cavity temperatur

diode current

Temperature

Control

iScan

Head

iScan

Control Unit

(µC)

PC

Photo Detector

Signals

Oscilloscope

iScan

In general, tuneable lasers contain a number of electrically driven resonator elements.

A mode-hop free frequency scan requires a set of complicated voltage and/or current

functions to be applied to these elements. E.g. external cavity diode lasers need the

cavity temperature, the injection current and the grating position to be adjusted

simultaneously.

As the iScan system includes a more-dimensional arbitrary waveform generator and a

microprocessor, it can scan through all accessible parameters automatically and find

single-mode "corridors" in the parameter space.

Mode chart of a tunable diode laser,

recorded with the setup described

above.

The plot characterizes laser operation as

a function of temperature and injection

current of the laser diode. Red stripes

indicate areas of stable single mode

operation, compared to the blue stripes

indicating multi mode operation.


Application Example II: cw THz

Precision Frequency Metrology and Stabilization for Continuous Wave (cw)

THz Sources Based on Two-Color Laser Mixing

iScan

One method of generating THz radiation is optical heterodyning of two continuous laser fields

on a semiconductor photomixer. The advantage of a cw THz source compared to pulsed

sources is the fact that measurements can take place at arbitrarily chosen, fixed or variable

THz frequencies for unlimited and uninterrupted time intervals. This allows, e.g., for high

resolution spectroscopy, or for interferometric distance or refractive index measurements.

Laser1

Laser2

BS1

BS1

iScan

#1

iScan

#2

X1

Fig.1: Typical cw THz setup with interferometric frequency control (Laser1/2: Tunable DFB diode lasers;

iScan 1,2: iScan interferometer; BS: Fiber coupler; EA, RA: emitting/receiving antenna; EL/RL:

emitter/receiver lens; SG bias signal generator; TIA: transimpedance amplifier; LIA: lock-in amplifier; SP:

signal processing)

EA

THzR

EL

SG

T

RL

RA

TIA

LIA

SP

frequency shift /GHz

beat frequency /MHz

Example 1: Precisely linear 1000GHz scan with

some seconds hold at either end

Example 2: Long-term stable optical beat

frequency (at 1K change of ambient temperature)

Servo loop for DFB laser diodes

The servo consists of a pair of nested

PID loops. The first PID adjusts the

laser current such that the laser

frequency approaches its target

value. In order to prevent changes of

the laser power, a second PID

controls the temperature in a way that

the output power remains constant.

actual

j

j 0

Dj

set point

(µC)

control

deviation

PID-

PID

Regler

laser current

DFB diode

I LD

TEC

Literature:

Deninger et al.: Precisely tunable

continuous-wave terahertz source

with interferometric frequency control

R E V I E W O F S C I E N T I F I C

INSTRUMENTS 79, 044702 (2008)

temperature

rate action (µC)

PID-

PID

Regler

temperature

control


Application Example III

Phase Shifting Interferometry

Extremely precise inspection of

high quality optics with a Fizeau

Interferometer

Laser

Regulator signal

for frequency stabilisation

Temperaturstabilization

iScan

Measurement Head

iScan

control electronics

PC

Interferometer

signals

Frequency setting,

Scan definition

Telescope

Test object

Reference

Surface

CCD-camera

iScan

Conventional phase shifting interferometers need the reference surface to be moved

in l/8 steps for the phase extraction. This mechanical motion can be replaced by an

adequate shift of the laser wavelength. In this case, the iScan system guarantees

high-accuracy wavelength stepping at arbitrary step width and duration.


Application Example IV

iScan

LIDAR and spectroscopy

The usage of iScan allows for

• dynamic frequency hopping,

• variable offset stabilization,

• top-of-fringe stabilization and

• side-of-fringe stabilization.

DIAL

Switching amplitude:

arbitrary (limited by the laser)

Switching frequency: ~1 kHz

(limited by laser mechanics)

(small jumps: up to 100 kHz)

Switching accuracy: ~10 MHz

Switching repeatability:~1MHz

Complex Measurements

Use of spectroscopic features to

optimize tuning parameters.

Arbitrary number of measurement

points.

Spectroscopic reference

Use of a well known atomic

transition as reference.

Automatic online recalibration of

laser tuning parameters.


Technical data

Interferometer wavelength range:

Power requirements:

Free spectral range of interferometer:

Beam diameter for free-beam head:

Frequency stability:

Frequency linearity:

Frequency scale error:

Fiber connector:

Dimensions:

measurement head

control electronics in 19“-rack

Interface:

Electrical supply:

380 nm to 1100 nm

800nm to 1700nm (IR option)

1200nm to 2700nm (IRext option)

(other wavelengths on request)

minimum 20 … 100 µW (wavelength dependent)

maximum 50mW

2 / 4 / 8 or 100 GHz (others on request)

0.7 … 3 mm


iScan

03/2013


CoSy

CoSy

Compact Spectroscopy unit for absorption saturation

spectroscopy

The method of saturation spectroscopy allows to represent a

wavelength with extremely high precision, e.g., for absolute

stabilization of tunable lasers.

Example

Doppler-free absorption

saturation spectrum

of the Cs-D line 2

www.TEM-Messtechnik.de


Principle of Operation

CoSy

The method of saturation spectroscopy

allows to represent a wavelength with

extremely high precision, e.g., for

absolute stabilization of tunable lasers.

Light from a tunable laser is led into a

glass cell filled with a suitable gas, the

particles of which absorb light of

particular wavelengths. By the technique

of Doppler-free saturation spectroscopy,

a suitable optical setup consisting of

several part beams compensates for the

Doppler broadening of atomic lines to a

large extent, which highly increases the

resolution of the measured absorption

lines.

Usually this is achieved by using a

relatively complex opto-mechanical

setup. The truly compact CoSy system

contains this setup and also all the

evaluation electronics needed to obtain

a Doppler-free saturation spectrum as

an output voltage directly observable on

an oscilloscope.

CoSy measurement head

and CoSyControl electronics

The laser irradiating the system can thus be stabilized to any of the detected lines.

This may be done for example using TEM Messtechnik´s LaseLock or the modules

PID110 or LIR110 by TOPTICA Photonics. In this way a frequency uncertainty below

-9 .

1 MHz can be achieved, corresponding to a relative uncertainty of 10

The complete opto-mechanical setup, consisting of beamsplitters, mirrors, detectors,

and the spectroscopy glass cell, is integrated in the CoSy measurement head. As the

degree of absorption depends on the vapor pressure of the chemical element in the

glass cell and therefore on its temperature, the CoSy head is equipped with a

regulated cell heating.

CoSy integrated into

DL 100

alkali spectrocopy cell

CoSy head from

the inside


Block Diagram

For operation, a laser beam is

directed into the CoSy head.

For easy adjustment, an FC

single-mode fiber connector

can be mounted at the input

aperture.

PD Amp Gain

Set Temp

optional: Magnet Mod

Supply

CoSy Control

Saturation

Spectroscopy

Optics

Normalization

Difference

A

B

Intensity

outputs

signal selection

mains connector

(200...240 VAC /

100...120 VAC)

CoSy

Beam

Splitter

CoSy Head

The CoSy head is controlled by the power supply and control electronics

CoSyControl. This includes the power supply module, the processing unit for

generation of normalisation and difference signals, the BNC-connectors for the output

signals (A, B and Intensity), as well as the temperature control unit, and optionally the

magnetic modulation unit.

CoSyControl generates the doppler free saturation spectrum of the chosen chemical

element from the CoSy head signals by amplification and electronic signal processing.

Product Variants

"FC":

"FC-APC":

"COIL":

For easier adjustment, the CoSy head can be equipped with an FC

single-mode fiber connector.

As "FC", but for APC- (angle-polished-) fibers.

For some applications the CoSy system provides optionally the

possibility to apply a magnetic field (AC or DC) to the cell. This is

done by a coil, which is located around the cell.


Technical Data

CoSy

Dimensions of the glass cells: ˘ 25 mm x 25 mm or ˘ 25 mm x 15 mm

Glass cell filled with one of the following elements:

85

87

Rubidium (mixture of Rb and Rb)

39 41

Potassium (mixture of K and K)

133

Caesium ( Cs)

Other cells on request.

Recommended optical input power: < 1mW, depends on used element

Size of free beam:

< 3 mm diam.

Polarization of free beam:

perpendicular to table top

Gain of the photo detector amplifiers: adjustable via range switch (coarse)

and trim potentiometer (fine)

Output level: max. 10 Vpp

Set temperature of the glass cell: adjustable via trim potentiometer,

in the range of 20 to 40 °C (no cooling)

Optional AC or DC magnetic field: magnetic flux density adjustable,

maximum current 0.1 Ampere

Housing dimensions:

CoSy head:

80 mm x 80 mm x 114 mm

CoSyControl mini:

88 mm x 125 mm x 209 mm (2 height units)

Power supply of CoSyControl: 100...120 VAC / 200...240 VAC, 50...60 Hz

10/2013


PhaseLock

Universal and compact phase stabilization electronics

PhaseLock

!

Compact, stand-alone locking electronics for pulsed lasers

! Pulse timing stabilization

! 2 independent PID regulators

! High-voltage output for piezo actuators

! Lock point validity detection and automatic "search" function

! Multi-channel monitor for display of regulator signals

Application

! Stabilization of the repetition rate

and pulse timing of pulsed lasers

! Phase locking of the optical

frequency of continuous lasers

! Control of the pulse envelope

phase (carrier offset frequency) of

femtosecond lasers

! Stabilization of frequency or phase

of electronic oscillators

www.TEM-Messtechnik.de


PhaseLock

Block Diagram

PhaseLock combines all components required for or beneficial to phase stabilization in a

user-friendly compact device:

! fast input amplifiers

! phase comparator

! 2 independent PID regulators, adapted especially to resonant systems like piezo-driven

optical components

! scan generator, for adjustment or supervision of the physical system

! output amplifier, user-selectable as high-voltage amplifier for piezo actuators, or as lowvoltage

amplifier generating a control signal for external amplifier sections

! logic section for automatic recognition of successful locking

Signal Diagram

If the frequency difference of the input signals is

too large, a simple PID controller will not be able

to align the input frequencies within one cycle of

the difference signal. Then, the control loop will

fail to lock. In order to avoid this problem, the

PhaseLock is equipped with a discriminator: As

long as the frequency difference is higher than a

preset value, the output voltage ramps through

its full range. As soon as the frequency

difference is lower than a preset value

(“frequency lock window”), the PID loop is

closed.

lock window


Application Example

The PhaseLock compares the phase of an RF input signal with a local oscillator (LO).

fs oscillator

RF synthesizer

2)

The PhaseLock needs two input signals:

1) the signal of the oscillator under control

(e.g. for a pulsed laser, the signal of a fast

photo diode)

2) the signal of a reference oscillator (e.g.

from an RF synthesizer)

The PhaseLock mixes (multiplies) the

input signals. This results in an

intermediate signal, the frequency of which

is the difference of the frequencies of the

input signals.

1)

I

setpoint

Q

delay 1/4f

PID

PID

lock

detection

slow

PZTs

fast

PhaseLock

a) IQ (quadrature) mixer output

(while unlocked)

b) Phase memory analog output

(while unlocked). The amplitude

of 10Vpp corresponds to full 8192

cycles!

c) IQ (quadrature) mixer output

when locked

Option MCPC

If phase excursions exceed +/-p, a conventional RF mixer loses cycles. This

results in phase slips, which is sometimes not acceptable. In order to avoid this

problem, the PhaseLock can be equipped with a phase counter, which acts as a

"memory" for lost cycles (option MCPC). The output of this add-on circuit is an

analog voltage proportional to the phase difference within a range as large as +/-

8192p. This provides a long time for the PID servo loop to settle, thus enabling

phase locks even in diffcult situations in which standard locking schemes would

fail.


PhaseLock

Technical Data

Signal inputs Impedance: 50 Ohm

RF bandwidth

1GHz

Input power

LO: +13dBm

IF Bandwidth

300kHz (standard, higher BW on request)

Sampling Rate

2.5MS/s

Option MCPC Phase memory (cycles) +/-4096·2p

Outputs Voltage range +/- 10V at 1kOhm load

Impedance

50 Ohm

Sampling Rate

2.5MS/s

Drivers (optional) HV amplifier 2x 150V, 50mA, BNC

Lock detection Frequency window adjustable

Twin PID regulator combinations

independent / parallel / series

over-all delay

400ns

Scan generator Output frequency 100mHz ... 20kHz (triangular shape)

Supply Voltage range 100..120V / 220..240V AC, 50..60Hz

Housing Dimensions HxWxD 88mmx260mmx373mm

Display Size 4.3"

Resolution

480x272

Colors

65 536 (16 bit)

Costumer specific values on request. Subject to change without notice.

03/2013


NoiseEater

NoiseEater

Universal laser intensity stabilization

=

Intensity noise cancellation

=

Controlled laser power setting or switching

=

Fixed or automatic set point adjustment

=

For use with AOM, EOM or micro stepping motor

=

Including drivers HV or RF, resp. optional

Example

intensity(t)

minimum

setpoint

input intensity

intensity(t)

setpoint

output intensity

www.TEM-Messtechnik.de

t

t


NoiseEater

Principle of Operation

Laser intensity stabilization

By means of acousto-optic or electro-optic

modulators, or by rotating polarization

optics, the power of a transmitted laser

beam may be controlled electronically. The

fast PID regulator of the NoiseEater allows

to stabilize the laser power to a fixed value,

thus reducing the undesired intensity

noise.

Laser

Auto set point

AOM*

NoiseEater driver

PD input

output

photo detector

beam splitter

diffracted beam

* or EOM, or rotating wave plate.

The NoiseEater offers a feature for automatic set point adjustment. That is, the user

chooses a fixed average transmission of the AOM / EOM, say 90%, e,g. The

NoiseEater PID then cancels out all short-term fluctuations of the laser power, while

the long-term transmission of the AOM / EOM remains constant. The result is a sort

of optical intensity lowpass filter.

Block diagram

PID-

Regulator

output amplifier

PD input

PDA

PD gain

setpoint

offset

fix

auto

actual

set

on

off

manual

output

(to driver)

-

S

dt


1 input gain

2 set point

3 discrimination of the error sign

4 fixed or automatic set point

5 regulator gain

6 P coefficient of regulator

7 I coefficient of regulator

8 regulator on/off or

manual control

9 module on / off

10 input level indicator

11 input for photo detector

12 input offset compensation

13 output PD monitor signal

14 input for set point modulation

15 D coefficient of regulator

16 input for output modulation

17 output level indicator

18 output to AOM-/EOM driver

19 output sign switch pos/neg

User Elements

1 2 3 4 5 7 8 9

setpoint

switch

man auto

The NoiseEater output voltage controls either the RF power driving an AOM, the voltage

applied to an EOM, or the position of a micro-stepping motor. As an option, the suitable

drivers are available as external or internal modules.

setpoint

PD gain

0

PD in

clip

ok

low int

PD offset

error

PD monitor

set

ok

actual

P

gain

I

D

ext.

setpoint

adj

off

reg

output

mod.

NoiseEater 3V0

regulator

switch

pos

output

10 11 12 13 14 15 16 17 18

6

sign

switch

neg

clip

ok

19

NoiseEater

Description

The NoiseEater contains an input amplifier with its gain switchable in steps of 1 / 3 /

10 / 30. If switch (8) is set to "adj", the output voltage can be adjusted directly by pot

(2). If switch (8) is set to "reg", the output voltage is controled by the PID regulator in

such a way that the measured power equals the setpoint chosen by pot (2). If switch

(4) is set to "auto", the NoiseEater chooses the setpoint automatically for best noise

cancellation.

Both set point and output voltage may be modulated via BNC inputs.

Product Variants

"NoiseEater EOM":

"NoiseEater AOM":

"NoiseEater µSTEP":

“NoiseEater MZM”:

"option TTL":

"option USB":

Including high voltage amplifier

Including RF driver and power amplifier

Including micro step driver for motors

Including driver for Mach - Zehnder fiber modulator

Digital input for triggered pulses

external control of parameters by PC via USB interface


NoiseEater

Technical Data

General:

Input voltage range:

Bandwidth:

Optional AOM driver:

Frequency:

RF power:

Optional EOM driver:

Output voltage range:

Output current:

Housing (H x W x L):

w/o driver:

with driver:

Power supply:

Subject to change without notice.

switchable 30 mV / 100 mV /300 mV / 1 V

up to1MHz (depending on actuator)

customer specific: 40..220 MHz

up to 6 W

customer specific: up to 1000 V

depending on output voltage range

88 mm x 125 mm x 209 mm (2 height units)

88 mm x 260 mm x 261 mm (2 height units)

100...120 VAC / 200...240 VAC, 50...60 Hz

06/2011 11/2011


miniScan

miniScan

Scan generator, piezo driver and PD amp - for Fabry-Perot

interferometers and other applications.

The FPI is tuned by moving a resonator mirror via

a piezo element. The output amplitude and the

frequency behavior of the scan generator and

piezo driver have been adapted to these piezo

actuators (up to 150 Volts, 200 Hz).

The flexible low noise photo diode amplifier,

incorporated in the same laboratory housing,

allows to monitor for example the single

longitudinal mode behavior of tunable lasers.

www.TEM-Messtechnik.de


miniScan

Scan Generator

• Frequency: 100 mHz … 200 Hz (linear

ramp),adjustable via a three stage range

switch (coarse) and a potentiometer

(fine)

• Bandwidth limit adapted to piezo actuators

• HV / LV power supply (low noise linear

regulator, no switching power supply)

• HV amplifier with very low noise class-A driver

• Offset and amplitude of output signal

adjustable via potentiometer

• Output amplitude 0 to + 100 volts, maximum

2.5 mA (other voltages/currents on request)

• Standard trigger output with TTL level (5V)

• Direct supply connection (100...120 V /

200...240 VAC, 50...60 Hz), automatic supply

voltage detection

Photo Diode Amplifier

! Universal pre-amplifier for photo

diodes, transimpedance amplifier

(current-to-voltage converter)

! Connection of different photo detector types

via a shielded cable (to BNC socket)

! Very robust against oscillations, so that an

adaption to the photo diode and cable

used can be omitted in most cases

! Amplification of the photo diode input signal

adjustable via range switch (coarse switch

with 6 positions) and via potentiometer

4 7

(fine,10 to 100%), 3.3 x 10 … 1 x 10 V/A

! Offset compensation of the photo diode

input signal adjustable via potentiometer

! Output coupling switchable between AC

(10 Hz), AC-HF (300 Hz) or DC coupling

! Bandwidth: 30 kHz

! Laboratory housing 125 x 88 x 205 mm

Subject to change without notice

03/2013


PulsePicker

PulsePicker

Repetition Rate Reduction System

! for optical gating with a fiber-based electro-optical (EOM) or

acousto-optical (AOM) modulator

! user-friendly front panel with LCD menu

! full PC control via USB or RS232

! for EOM: automatic control of offset voltage

! modular system

Application example (EOM)

pulsed laser

PulsePicker

pulse train

n

EOM

offset

control

picked pulse train

www.TEM-Messtechnik.de


PulsePicker

Technical Data

Trigger frequency range:

Trigger amplitude:

10 MHz ... 500 MHz

‡ 50mVpp

32

Divisor: 2...255 (optional: 2...2 -1)

Input trigger sign:

pos / neg switchable

Output amplitude (switching pulses): 1V...3.5V @ 50W

Output offset voltage (EOM version) -4V...+4V @ 50W (-10V...+10V @ 1MW),

automatic control

Analog output voltage for AOM

power control (AOM version)

Operation modes:

Housing dimensions:

Interfaces:

Software / Drivers:

Power supply:

0...+5V @ 50W

Picking / All through / All blocked

88 x 260 x 373 mm

USB, RS232 serial, (Ethernet optional)

including visualization and measurement software

Kangoo, LabView VIs available

100...120/200..250 VAC, 50/60 Hz

Subject to change without notice

03/2013


PDA-S

PDA-S

The PDA-S is a universal, sensitive transimpedance

amplifier for photo diodes.

This versatile amplifier is very robust against oscillations and can be

directly connected to various types of photo diodes by a shielded

cable without further adaption. Photo diodes with positive, negative

or without reverse voltage can be used.

Principle of operation

input

offset

gain

AC-LF

AC-HF

DC

+ +

The two independently driven output

channels are used for application and

monitoring without inteference.

offset A

offset B

+

output A

output B

www.TEM-Messtechnik.de


Technical Data

Housing dimensions:

Overall dimensions:

84 mm x 55 mm x 24 mm

112 mm x 55 mm x 37mm

PDA-S

Amplification switchable:

Amplification fine-tuning:

Lower cut-off frequency switchable:

Upper cut-off frequency:

Supply voltage:

33 / 100 / 330 / 1,000 /

3,300 / 10,000 V/mA

10% ... 100%

DC / 10Hz / 300Hz

45kHz ... 1MHz

(depends on amplification)

+12 V DC (AC adapter

included 230V or 115V)

Technical specifications are subject to change without notice.

06/2011


miniPiA

miniPiA

f 0

The compact piezo amplifier

The miniPiA is a fast multi-channel high voltage amplifier in a

compact design, especially developed for low-noise driving of

piezoelectric actuators.

Electronic filters serve to suppress mechanical resonance effects.

Block Diagram

Input

X

Gain

S

offset

f 0

Low Pass

Filter

overload

detection

HV Amplifier

output

www.TEM-Messtechnik.de


Description

miniPiA

Both gain factor and DC output level are individually user adjustable for each channel by

means of potentiometers. Moreover, each amplifier is equipped with a second order lowpass

filter, the cut-off frequency of which can be adjusted individually as well. By means of

these filters, resonances in piezo driven systems can be suppressed. Thus, servo loops

show significantly better perfomance.

Technical Data

Input voltage range:

Gain:

Small-signal bandwidth:

Output voltage / current:

Housing dimensions:

Supply voltage:

Product variants:

Specifications are subject to change without notice.

-5...+5 V

user adjustable (0 ... 15x)

adjustable 150 Hz...8 kHz

0...150 V, 15 mA average per channel,

average sum current max. 25mA

higher voltage/current values on request!

88 mm x 125 mm x 209 mm (H x W x D)

100...120 / 200...240 V, 50...60 Hz

"miniPiA 103": triple channel

"miniPiA FiberLock": double channel with

multi-pin connectors

06/2011


miniSupply

miniSupply

Universal symmetric DC power supply

! +/- 15V, 250mA

+/- 15V, 250mA

! low noise

low noise

! feed-through of signals from connected TEM devices

! feed-through of signals from connected TEM devices

Variants

! miniSupply:

! miniSupply PSD:

! miniSupply Quad:

! miniSupply APD:

general purpose: photo

detectors, active filters,

signal generators

position sensitive

detectors

4-quadrant detectors

high voltage supply for

avalanche photo diodes

Application example: PSD

www.TEM-Messtechnik.de


Technical Data

miniSupply

Output voltage: +/-15 V DC (other values on request)

Maximum current (peak):

Maximum current (cont.):

Housing dimensions:

Supply voltage (AC):

... 2 1

15 ...

1A

250mA

44 mm x 125 mm x 209 mm (1 height unit)

100...120 VAC / 200...240 VAC, 50...60 Hz

1 ... 5:

6:

7:

10, shield:

signals to BNC outlets

+15 V

-15 V

ground

Subject to change without notice

06/2011


Development, Manufacturing and Distribution

12/2013

TEM Messtechnik GmbH

Grosser Hillen 38

30559 Hannover

Germany

tel. +49-511-51089630

fax +49-511-51089638

info@tem-messtechnik.de

www.tem-messtechnik.de

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