Product Catalog TEM

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 


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 ® 


- 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 


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 



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

in space for many reasons: 

µAligna 


inside the laser, 

movements by 

frequency detuning, 

by power variation, etc. 

Laser 

Cooling System 


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 


- vizualization of all μController parameters 

- logging of any value vs. time 


- 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 


- two ultra microstepping linear actuators 

- manual adjustment by knurled knobs 


- several fixing methods for mirrors or other 

components 



- 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


µAligna 

Dimensions: 

control electronics: 



PSD-4D i: 

PSD-4D e: 

Interfaces: 

protocol: 

Aligna 

µC: 


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) 



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) 


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 


µAligna Motor Control 


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 


- vizualization of all μController parameters 

- logging of any value vs. time 



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

9x (Linux via Wine) 

- plain-text communication with the 

μController for simple integration with other 

control software 



- two ultra microstepping linear actuators 

- manual adjustment by knurled knobs 


- several fixing methods for mirrors or 

other components 



- 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) 


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 


Basic Operation 

An Electronic 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 


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 


reset 

program

FiberLock 


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 


- 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 


Software 

FiberLock 


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 


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 



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) 


10/2014

® 


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 


Digital LaseLock


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) 


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 ® 




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 


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 


Quadrature Signals 

l 

Laser Wavelength 


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 


signals 

Regulator signal 

for frequency stabilization 

iScan 


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 


laser beam to 

experiment 

Wedged 

Beam Splitter 

Fabry-Perot- 


Normalisation 


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 


Laser 

Regulator signal 

for frequency stabilisation 

Temperaturstabilization 

iScan 

Measurement Head 

iScan 

control electronics 

PC 


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: 


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 



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.


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 


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 


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 


t 

t

NoiseEater 


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 


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 



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. 


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 


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 


PulsePicker 


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: 


Interfaces: 

Software / Drivers: 

Power supply: 

0...+5V @ 50W 

Picking / All through / All blocked 

88 x 260 x 373 mm 

USB, RS232 serial, (Ethernet optional) 


Kangoo, LabView VIs available 

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


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 




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 


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. 


Input voltage range: 

Gain: 

Small-signal bandwidth: 

Output voltage / current: 


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 



miniSupply 

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

Maximum current (peak): 

Maximum current (cont.): 


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 


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

Product Catalog TEM

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