The LINOS Faraday Isolators - Qioptiq Q-Shop

The LINOSFaradayIsolatorsIsolators

The LINOS Faraday IsolatorsLINOS has Faraday isolators for all wavelengthsin the range from 390 nm to 1210nm, as well as for 1310 nm and 1550 nm. Isolatorsfor other wavelengths can be implementedupon request. Many isolators can beadjusted over a wide spectral range; variablefrequency models can even be set for an intervalof several hundred nanometers. At thesame time, LINOS Faraday isolators are distinguishedby high performance combinedwith the greatest possible transmission. Withmore than 60 dB, our two-stage isolators offerthe best isolation available on the market.The consistently high LINOS quality is assuredby a combination of our many years ofexperience, an intelligent design, modernengineering with computer simulations andsophisticated processing. The result is the incomparablevalue that distinguishes allLINOS products – value you can count on!LINOS quality criteria:!Special features:We also have LINOS Microbenchcompatibleversions of our isolatorsfor the most commonly usedwavelengths.We are always happy to implementcustom designs and systems,even for one-time orders.Ideal areas of application:Protecting lasers from damage orinstability; decoupling oscillatorsand amplification systems; injectionlocking. panels, and more.• Isolation > 30 dB (one-stage) or> 60 dB (two-stage)• Transmission > 90 % (one-stage) or> 80 % (two-stage)• All models can be used in widewavelength rangesMore information:Contact us to receive our comprehensivenew brochure, "CrystalTechnology", by mail, or downloadit from: www.linos.com/ct.626US-Phone +1 585 223-2370 UK-Phone +44 2380 744 500

Faraday IsolatorsCharacteristics and Technical Features 628Advantages of Faraday Isolators 629Faraday Isolators, Overview 630Single Stage Faraday Isolators 631Faraday Isolators ____________________________Isolators with 2mm Aperture, SV / SI-Series 632Isolators with 3.5 and 5mm Aperture,SC-Series 633Isolators with 5mm Aperture, LP-Series 634Isolators with 5mm Aperture, SV / SI-Series 635Isolators with 8mm Aperture, SI-Series 636Special Isolators with 5mm Aperture,SV-Series 6374 mm Aperture Isolators withMagnetooptical Crystal​Film 638Isolators with a Broad Tuning Range 6395 mm Aperture Tunable Isolators,SV / SI-Series 6408 mm Aperture Tunable Isolators, SI-Series 641Two Stage Faraday Isolators 6425 mm Aperture Two Stage Faraday Isolators(non-tunable), TV / TI-Series 6435 mm Aperture Two Stage Faraday Isolators(tunable),​DLI-Series 644Germany-Phone: +49 (0) 551/ 6935-0 France-Phone: +33 - 47 25 20 420627

Faraday IsolatorsAdvantages of Faraday IsolatorsIsolatorsHigh IsolationThe properties of the Faraday isolatorare determined by the quality of theoptical elements and the uniformity ofthe magnetic field. The entrance and exitpolarizers exhibit a very high extinctionratio, so that the isolation is mainlylimited by inhomogenities in the crystalmaterial. Specially selected crystalmaterials with a high Verdet constantcombined with permanent magnets witha high remanence enable us to useshorter crystals and obtain an isolation> 30 dB.The radiation blocked by the entranceand exit polarizers is not absorbedinternally, but is deflected by 90° withrespect to the beam direction. Thisensures a stable thermal operation evenat higher laser power levels. The blockedradiation can be used for other applications.All optical surfaces are slightlytilted relative to the beam axis.Low Insertion LossThe high transmission, typically > 90 %,is achieved by using absorption freematerials and antireflective coatings withlow residual reflectivity on all entranceand exit surfaces.large aperturecompact designhigh isolationLarge Aperture, Compact Designlow insertionlossAll optical elements have been alignedto eliminate beam shading and allow foreasy adjustment. Focusing is notnecessary.The compact design is achieved by usingrare earth magnets with the highestremanent magnetism and TGG crystalmaterial with a high Verdet constant.The isolator is suitable for divergentbeams or in setups with limited space. Aminimal optical path length in theisolator results in the lowest possibleinfluence on the image.Three sides of the entrance and exitpolarizers are usable and readilyaccessible for easy cleaning. The degreeof isolation can be adjusted in a widerange.Mounting FlexibilityThe isolators can be mounted directly viathreaded holes in the housing or viaadditional base plates or angle brackets.ApplicationsThe ongoing development and refinementof laser technology have created aneed for optical components that shieldthe laser resonator from back reflections.Faraday isolators provide an efficientmethod of suppressing instabilities andintensity fluctuations in laser devices.Typical applications are:••Protection of the resonator in solidstate and gas lasers from backreflections••Prevention of parasitic oscillation inmultistage solid state amplifiers••Protection of diode lasers against backscatter and extraneous lightGermany-Phone: +49 (0) 551/ 6935-0 France-Phone: +33 - 47 25 20 420629

Faraday IsolatorsSingle Stage Faraday IsolatorsIsolatorsTechnical OverviewIntroductionThe compact Faraday isolators in thischapter use a single stage rotator. Thelength is kept to a minimum with the useof powerful permanent magnets in anoptimized geometry. A 360° rotation ofthe exit polarizer provides a maximumextinction over a certain range aroundthe central wavelength. The entranceand exit polarizers are polarizing beamsplitter cubes. The blocked radiation isdiverted by 90° and is readily availablefor other applications. At 30 dB, thespecification of the isolator is sufficientfor most standard applications. Forspecialized applications, selectedisolators with an extinction up to 45 dBare available.An even higher extinction is provided bythe two stage isolator series.Wavelength tuningThe Verdet constant of the TGG crystal isdependent upon wavelength andtemperature. In order to compensate fordifferent temperatures or differentwavelengths, it is possible to tune theisolator in order to achieve maximumextinction. Tuning the isolator isaccomplished by rotating the holder ofthe exit polarizer with respect to anengraved angular scale.Reduction of transmission T(Δλ) [%]Tuning of design wavelength ΔλThe graph shows the typical reductionfactor of the transmission (Δλ) that is dueto the tuning of the isolator to awavelength λ that is different from thedesign wavelength λ 0. The bar has alength that covers the wavelength rangefor which 0.95 < T(Δλ) < 1. The bulletindicates the design wavelength λ 0. Theoverall transmission of a Faraday isolatoris equal to T t= T 0x T(Δλ), where T 0is afactor that represents the transmission ofthe polarizers. At the design wavelengththe overall transmission of the Faradayisolator is λ 0> 90 %Broadband optionOn Broadband (BB) models the isolationis improved over a broadband spectrumby compensating rotational dispersion ofthe TGG. This renders the device usableover a wavelength range of ±50 nmwithout additional adjustment. Theisolators can be mounted on rods,cylindrical mounts or by using theassembly surfaces so that the laserpolarization can be oriented horizontallyor vertically.ApplicationsThe following single stage Faradayisolators are suitable for all lasersoperating in the range especially:••Ar+ and Kr+ lasers••other Ion lasers••HeNe lasers••other Gas lasers••Dye lasers••Diode lasers••Ti: Sapphire lasers••Cr:LiCAF lasers••Short Pulse lasers••Mode-synchronized lasers••Alexandrite lasersGermany-Phone: +49 (0) 551/ 6935-0 France-Phone: +33 - 47 25 20 420631

Faraday IsolatorsIsolators with 3.5 and 5mm Aperture, SC-SeriesFI-x-3SC / FI-x-5SCIsolators• Extreme compact design• Isolation better than 30 dB, typically38-42 dB over the entire wavelength​range, custom isolation values on​request• TGG crystal• Rare earth magnet• Output polarizer, 360° rotation,​engraved tuning scale• Access to blocked beam• Optional version with Brewster plate​polarizers (BP) on request forFI-1060-xSC, isolation better than30 dB• Mounting:via four M2 threaded holes​at thebottom side and at backside;15​x 22.5 mm separation(3SC-version,​except FI-1210-3SC);49.5 x 22.5 mm​separation(FI-1210-3SC);13 x 22.5 mm​separation (5SC-version)FI-x-3SC (x = 980, 1064 nm)FI-x-5SC (x = 930, 1064 nm)• Damage thresholds > 2 kW / cm 2 cw​(488 / 514 nm)• Damage thresholds > 200 mJ / cm 2 for​pulses of 10 ns (1064 nm)• Damage thresholds > 28 mJ / cm 2 for​pulses of 280 fs (850 nm, 20 Hz)FI-1210-3SCHigh qualityLINOS isolators series SC feature small and compact size with broadwavelength range.FI-x-3SC / FI-x-5SCProductIsolation,​guaranteed/typical​(dB)Transmissionat designwavelength(%)Transmissionat boundry​wavelength(%)Tuning​rangetypical​(nm)A​p​er​tu​re​(​m​m​)Dim​ensi​ons​(mm​)Order-NoFI-930-5SC > 30/38-42 > 90 > 85 880 - 990 Ø​5 45x45​x58 84 50 1037 007FI-980-3SC > 30/38-42 > 90 > 85 925 - 1040 Ø​3.5 40x40​x60 84 50 1036 004FI-1060-3SC > 30/38-42 > 90 > 85 1010 - 1120 Ø​3.5 40x40​x60 84 50 1036 001FI-1060-5SC > 30/38-42 > 90 > 85 1010 - 1120 Ø​5 45x45​x58 84 50 1037 001FI-1210-3SC > 30/38-42 > 90 > 85 1160 - 1260 Ø​3.5 45x45​x96 84 51 1010 0043FI-1210-5SC > 30/38-42 > 90 > 85 1160 - 1260 Ø​5 45x45​x96 84 51 1010 0053Germany-Phone: +49 (0) 551/ 6935-0 France-Phone: +33 - 47 25 20 420633

Faraday IsolatorsIsolators with 5mm Aperture, SV / SI-SeriesIsolatorsFI-x-5SV / FI-x-5SI• Isolation better than 30 dB, typically38-42 dB over the entire wavelength​range, custom isolation values on​request• TGG crystal• Rare earth magnet• Output polarizer, 360° rotation,​engraved tuning scale• Access to blocked beam• Optional version with Brewster plate​polarizers (BP) on request for FI-1060-5SI, isolation better than 30 dB• For upgrading to broadband-version​refer to chapter Special Isolators• Mounting:via two M4 threaded holes​at thebottom side and at the back​side;30 mm separation (5SV-version);40 mm separation (5SI-version);or via​base plate• Base plate included• Damage thresholds > 2 kW / cm 2 cw​(488 / 514nm)• Damage thresholds > 200 mJ / cm 2 for​pulses of 10 ns (1064 nm)• Damage thresholds > 28 mJ / cm 2 for​pulses of 280 fs (850 nm, 20 Hz)FI-x-5SV (x = 530, 630, 730, 780, 810, 850 nm)FI-x-5SI (x = 488, 910, 960, 1000, 1060 nm)FI-x-5SV / FI-x-5SIItem TitleIsolation​guaranteed /​typical(dB)Transmissionat​designwavelength​(%)Transmissionat​boundrywavelength​(%)Tuning​range​typical​(nm)Aperture(mm)Dimens​ions​Isolator​(mm)Dimensionsbase​plate(LxWxH)​(mm)Order-NoFI-488-5SI > 30/38-42 > 90 > 85 460 - 515 Ø5 58x58x95 70x58x8 84 50 1030 000FI-530-5SV > 30/38-42 > 90 > 85 505 - 565 Ø5 40x40x55 50x30x9.5 84 50 1013 002FI-630-5SV > 30/38-42 > 90 > 85 595 - 670 Ø5 40x40x55 50x30x9.5 84 50 1013 004FI-730-5SV > 30/38-42 > 90 > 85 690 - 780 Ø5 40x40x55 50x30x9.5 84 50 1013 034FI-780-5SV > 30/38-42 > 90 > 85 740 - 830 Ø5 40x40x55 50x30x9.5 84 50 1013 008FI-810-5SV > 30/38-42 > 90 > 85 765 - 865 Ø5 40x40x55 50x30x9.5 84 50 1013 033FI-850-5SV > 30/38-42 > 90 > 85 805 - 905 Ø5 40x40x55 50x30x9.5 84 50 1013 027FI-910-5SI > 30/38-42 > 90 > 85 860 - 970 Ø5 58x58x95 70x58x8 84 50 1031 002FI-960-5SI > 30/38-42 > 90 > 85 910 - 1020 Ø5 58x58x95 70x58x8 84 50 1031 006FI-1000-5SI > 30/38-42 > 90 > 85 950 - 1060 Ø5 58x58x95 70x58x8 84 50 1031 014FI-1060-5SI > 30/38-42 > 90 > 85 1010 -​1120 Ø5 58x58x95 70x58x8 84 50 1031 000Germany-Phone: +49 (0) 551/ 6935-0 France-Phone: +33 - 47 25 20 420635

Isolators with 8mm Aperture, SI-SeriesFI-1060-8SI• Isolation better than 30 dB, typically38-42 dB over the entire wavelength​range, custom isolation values on​request• TGG crystal• Rare earth magnet• Output polarizer, 360° rotation,​engraved tuning scale• Access to blocked beam• Optional version with Brewster plate​polarizers (BP) on request, isolation​better than 30 dB• Mounting:via two M4 threaded holes​at thebottom side and at the back​side;55 mm separation, or via base​plate• Base plate includedFI-1060-8SI• Damage thresholds > 2 kW / cm 2 cw​(488 / 514 nm)• Damage thresholds > 200 mJ / cm 2 for​pulses of 10 ns (1064 nm)• Damage thresholds > 28 mJ / cm 2 for​pulses of 280 fs (850 nm, 20 Hz)FI-1060-8SIItemTitleIsolation,​guaranteed /​typical(dB)Transmissionat​designwavelength​(%)Transmissionat​boundarywavelength​(%)Tuning​range​typical​(nm)Aperture(mm)Dimen​sions​Isolato​r(mm)Dimensionsbase​plate(LxWxH)​(mm)Order-NoFI-1060-8SI > 30/38-42 > 90 > 80 1010-1120 Ø 8 76x76x95 85x76x8 84 50 1032 000636US-Phone +1 585 223-2370 UK-Phone +44 2380 744 500

Faraday IsolatorsSpecial Isolators with 5mm Aperture, SV-SeriesFI-x-5SV-MB / FI-x-5SV-BBIsolators• Isolation better than 30 dB, typically38-42 dB over the entire wavelength​range, custom isolation values on​request• TGG crystal• Rare earth magnet• Output polarizer, 360° rotation,​engraved tuning scale• Access to blocked beam• MB-version: compatible to the​Microbench system• BB-version: for multiline lasers or​spectrally broadband lasers such as​fs-laser systems• Mounting:via two M4 threaded holes​at thebottom side and at the back​side;30 mm separation, or via base​plate• Base plate includedFI-x-5SV-MB (x = 530, 630, 730, 780, 810, 850 nm)• Damage thresholds > 2 kW / cm 2 cw​(488 / 514 nm)• Damage thresholds > 200 mJ / cm 2 for​pulses of 10 ns (1064 nm)• Damage thresholds > 28 mJ / cm 2 for​pulses of 280 fs (850 nm, 20 Hz)FI-x-5SV-BB (x = 780, 820 nm)FI-x-5SV-MB / FI-x-5SV-BBProductIsolation​guaranteed/t ypical(dB)Transmissionat​designwavelength​(%)Transmissionat​boundarywavelength​(%)Tuning​range​typical​(nm)Aperture(mm)Dimens​ions​Isolator​(mm)Dimensionsbase​plate(LxWxH)​(mm)Order-NoFI-530-5SV-MB > 30/38-42 > 90 > 85 505 - 565 Ø 5 42x36x65 - 84 50 1014 002FI-630-5SV-MB > 30/38-42 > 90 > 85 595 - 670 Ø 5 42x36x65 - 84 50 1014 004FI-730-5SV-MB > 30/38-42 > 90 > 85 690 - 780 Ø 5 42x36x65 - 84 50 1014 034FI-780-5SV-MB > 30/38-42 > 90 > 85 740 - 830 Ø 5 42x36x65 - 84 50 1014 008FI-810-5SV-MB > 30/38-42 > 90 > 85 765 - 865 Ø 5 42x36x65 - 84 50 1014 033FI-850-5SV-MB > 30/38-42 > 90 > 85 805 - 905 Ø 5 42x36x65 - 84 50 1014 001FI-780-5SV-BB > 30/38-42 > 90 > 85 725 - 825 Ø 5 40x40x61 50x30x9.5 84 50 1024 008FI-820-5SV-BB > 30/38-42 > 90 > 85 760 - 860 Ø 5 40x40x61 50x30x9.5 84 50 1024 009Selection guide• BB-Version:Due to a special design these isolators enable applications in abroad wavelength range without the need for adjustment• MB-Version:Due to their compact design these isolators are compatible toLINOS MicrobenchGermany-Phone: +49 (0) 551/ 6935-0 France-Phone: +33 - 47 25 20 420637

4 mm Aperture Isolators with Magnetooptical Crystal​FilmFI-x-4SL• Extremely small size• Isolation better than 35 dB• Faraday material: magneto-optical​crystal film in saturation• Ferrite permanent magnet• Output polarizer, 360° rotation• Access to blocked beam• Damage thresholds > 2 kW / cm 2 cw​(488 / 514 nm)• Damage thresholds > 200 mJ / cm 2 for​pulses of 10 ns (1064 nm)• Damage thresholds > 28 mJ / cm 2 for​pulses of 280 fs (850 nm, 20 Hz)FI-x-4SL (x = 1310, 1550 nm)FI-x-4SLItem TitleIsolation,​guaranteed/typical​(dB)Transmissionat design​wavelength(%)Transmisionat boundary​wavelength(%)Tuning​range​typical(nm)Aperture(mm)Dimensions​Isolator​(mm)Order-NoFI-1310-4SL > 35 > 90 > 85 1260 - 1360 Ø 4 14x23.5 84 50 1071 000FI-1550-4SL > 35 > 90 > 85 1485 - 1615 Ø 4 14x23.5 84 50 1072 000638US-Phone +1 585 223-2370 UK-Phone +44 2380 744 500

Faraday IsolatorsIsolators with a Broad Tuning RangeIsolatorsTechnical OverviewIntroductionThe function of the tunable isolators inthe following chapter is based on asingle stage Faraday isolator. Precisionmechanics allow a continuous adjustmentof the interaction between themagnetic field and the TGG crystalwithout moving any optical components.It is possible to set the rotation angle toany value between 0° to 45° within thewavelength range in order to study theeffects of varying degrees of feedback.Easy access to the blocked beam isprovided by polarizing beam splittercubes, which divert the blocked beam by90°.Precision mechanics allow the exactreproduction of adjustments previouslyestablished. And with the addition of anoptional micrometer display, an angularresolution in the arc minute range isachievable. The incorporation of verypowerful magnets ensures a compactand efficient design.OperationThe isolator can be mounted on rods,cylindrical mounts or by using theassembly surfaces so that the laserpolarization can be oriented horizontallyor vertically. The entry and exit polarizerscan be easily cleaned by removing thesecurity rings.ApplicationsThese isolators are suitable for all lasersoperating in the 390-420 nm respectivelyin the 500-1100 nm wavelength rangeespecially for:••Ar+ and Kr+ lasers••other Ion lasers••HeNe lasers••Other gas lasers••Diode lasers••Nd:YAG lasers••Ti: Sapphire lasers••Cr:LiCAF lasers••Dye lasers••Alexandrite lasers••Mode-locked lasers••Short Pulse lasersFaraday RotatorFor every laser line selected from 390 nmto a maximum of 1100 nm, everypolarization direction from 0° to 90° isprecise and reproducible.Germany-Phone: +49 (0) 551/ 6935-0 France-Phone: +33 - 47 25 20 420639

5mm Aperture Tunable Isolators, SV / SI-SeriesFI-x/y-5SV / FI-x/y-5SI• Continuous adjustment for​wavelengthwithout movement of​optical parts• Tunable with maximum transmission​and isolation over the complete​wavelength range• Isolation better than 30 dB, typically38​- 42 dB over the entire wavelength​range, custom isolation values on​request• TGG crystal• Rare earth magnet• Access to blocked beamFI-x/y-5SV• Mounting:via two M4 threaded holes​at thebottom side and at the back​side;20 mm separation (5SV-version);55 mm separation (5SI-version);or via​base plate, or via angle bracket(5SV-version only)• Base plate included, angle bracket​included (5SV-version only)• Damage thresholds > 2 kW / cm 2 cw​(488 / 514 nm)• Damage thresholds > 200 mJ / cm 2 for​pulses of 10 ns (1064 nm)• Damage thresholds > 28 mJ / cm 2 for​pulses of 280 fs (850 nm, 20 Hz)FI-x/y-5SIFI-x/y-5SV, FI-x/y-5SIProductIsolation,guaranteed /​typical(dB)Transmissionat design​wavelength(%)Tuning​range ​typical(nm)Aperture(mm)Dimen sions​Isolator​(mm)Dimensionsbase plate ​(LxWxH)(mm)Order-NoFI-390/420-5SV > 30/38-42 > 90 390-420 Ø 5 60x60x77 54x60x8 84 50 1046 000FI-420/460-5SV > 30/38-42 > 90 420-460 Ø 5 60x60x77 54x60x8 84 50 1046 001FI-500/780-5SV > 30/38-42 > 90 500-780 Ø 5 60x60x77 54x60x8 84 50 1040 000FI-500/820-5SV > 30/38-42 > 90 500-820 Ø 5 60x60x77 54x60x8 84 50 1041 000FI-500/1100-5SI > 30/38-42 > 90 500-1100 Ø 5 80x80x125 88x90x8 84 50 1042 000FI-660/1100-5SI > 30/38-42 > 90 660-1100 Ø 5 80x80x125 88x90x8 84 50 1044 000High qualityA precise mechanics enables a continuous wavelength adjustment.Without movement of the optics a broad wavelength range is realized.640US-Phone +1 585 223-2370 UK-Phone +44 2380 744 500

Faraday Isolators8mm Aperture Tunable Isolators, SI-SeriesFI-x/y-8SIIsolators• Continuous adjustment for​wavelengthwithout movement of​optical parts• Tunable with maximum transmission​and isolation over the complete​wavelength• Isolation better than 30 dB, typically38-42 dB over the entire wavelength​range, custom isolation values on​request• TGG crystal• Rare earth magnet• Access to blocked beamFI-x/y-8SI• Mounting:via two M4 threaded holes​at thebottom side and at the back​side;55 mm separation, or via base​plate• Base plate included• Damage thresholds > 2 kW / cm 2 cw​(488 / 514 nm)• Damage thresholds > 200 mJ / cm 2 for​pulses of 10 ns (1064 nm)• Damage thresholds > 28 mJ / cm 2 for​pulses of 280 fs (850 nm, 20 Hz)FI-x/y-8SIItem TitleIsolation,​guaranteed/typical​(dB)Trans missio​n(%)Tuning range​typical(nm)Ape​rtur​e​(mm​)Dimensions​Isolator(mm)Dimensionsbase plate​(LxWxH)(mm)Order-NoF​I-​5​0​0​/​1​1​0​0​-8​S​I > 30/38-42 > 90 500 - 1100 Ø 8 80x80x125 88x90x8 84 50 1043 000F​I-​6​6​0​/​1​1​0​0​-8​S​I > 30/38-42 > 90 660 - 1100 Ø 8 80x80x125 88x90x8 84 50 1045 000A closer lookThe excellent quality of the high-precision LINOS electro-optics fromQioptiq is a testament to decades of experience at both Gsänger andQioptiq. The 40-year history of these products is marked by immense customersatisfaction, and has established Qioptiq as a leader in laser technology.Dr. Gsänger, founder of Gsänger Optics in Munich was instrumental inthe success of the electro-optics. For more details, read the interviewwith Dr. Gsänger.Germany-Phone: +49 (0) 551/ 6935-0 France-Phone: +33 - 47 25 20 420641

Two Stage Faraday IsolatorsTechnical OverviewFI-x-5TI and FI-x-5TVDiode lasers are extremely sensitive toreflected radiation. Standard Faradayisolators typically achieve between 30dBand 40 dB isolation, which in some casesis not sufficient to suppress undesirablefeedback.Our two stage Faraday isolators weredeveloped for the special requirementsof diode lasers and square the standardisolation of single stage Faradayisolators. At the heart of this developmentis the use of two coupled isolatorstages together with the best polarizersavailable on the market.This configuration combines the exitpolarizer of the first stage with the entrypolarizer of the second stage to formone central polarizer.Arranging the polarity of the twomagnets to be opposite to each otherresults in two benefits: The polarizationdirection of the transmitted light remainsunchanged in the transmission directionand the effect of both magnetic fields isenhanced. Therefore this configurationalso leads to a more compact isolatorand a reduction of the optical pathlength which in turn enhances theoptical quality of the Faraday isolator.All optical surfaces are antireflectioncoated and the surfaces normal to thebeam axis are tilted. The polarizers aremounted in a way that allows easycleaning of the external optical surfaces.This guarantees that the isolation is notreduced by residual reflections andscattering from the isolator.Based on this special design a guaranteed60 dB isolation at the designwavelength, respectively within theadjustment range of ±10 nm, makesLinos two stage Faraday isolators thebest on the market.DLI, OverviewThe isolators of the DLI-series weredeveloped for the special requirementsof diode lasers in the visible spectrumand combine the outstanding isolationof a two stage isolator with the flexibilityof a tunable isolator.The DLI isolators are easily integratedinto an existing setup and can beadjusted to match any wavelengthwithout changing the laser polarizationor displacing the laser beam. Theisolators can be coarsely tuned byaltering the effective magnetic field inthe two isolator stages. A precisewavelength adjustment is possible byrotating the central polarizer with amicrometer set screw. The blockedradiation is deflected out of the isolatorat 90° with respect to the beam axis. It isnot absorbed by the interior of theisolator, but is available at the sidesurfaces of the polarizer and the exitwindow.DLI Injection LockingThe DLI injection version revolves thisoperating mode and uses the exitwindow for in-coupling of the seed laserfor injection locking while decouplingefficiently the master and the slave laserfrom each other at the same time. Likethis stable mode locking (e.g. of Ti:Sapphire lasers) is simplified.ApplicationsAll two stage isolators are typically usedto improve the power and frequencystability of diode lasers used in spectroscopy,interferometry and precisioncontrol as well as in alignment applications.Since the output polarization andthe beam position are conserved for alltwo stage Faraday isolators, the influenceof the smallest feedback effects onthe laser can be quantitatively examined.1 Entrance polarizer2 Tuning micrometer3 Exit window4 waveband adjuster5 Exit polarizer6 Adjusting screw7 Mounting surface8 Protective ring642US-Phone +1 585 223-2370 UK-Phone +44 2380 744 500

Faraday Isolators5mm Aperture Two Stage Faraday Isolators(non-tunable), TV / TI-SeriesFI-x-TV / FI-x-TIIsolators• Two coupled isolator stages in series• Especially high isolation > 60 dB• TGG crystal• Rare earth magnet• TV-version: wavelength range ±10 nm​depending on the central wavelength• TI-version: wavelength adjustable• Customized central wavelength on​request• Mounting TV-version: via two M4​threaded holes at the bottom side,30​mm separation• Mounting TI-version:via two M4​threaded holes at thebottom side or​at the back side,40 mm separation, or​via base plate• Base plate includedFI-x-TV• Damage thresholds > 2 kW / cm 2 cw​(488 / 514 nm)• Damage thresholds > 200 mJ / cm 2 for​pulses of 10 ns (1064 nm)• Damage thresholds > 28 mJ / cm 2 for​pulses of 280 fs (850 nm, 20 Hz)FI-x-TIHigh qualityHigh isolation (60 dB) and high transmission for wavelengths from650 nm to 1060 nm is guarantueedFI-x-TV / FI-x-TIProductIsolation,​guaranteed​(dB)Transmissionat design ​wavelength(%)Tuning range​typical(nm)A​p​er​tu​re​(​m​m​)Dimensions​Isolator​(mm)Dimensionsbase plate(LxWxH)(mm)Order-NoFI-650-TV ≥ 60 ≥ 80 - Ø​5 40x40x106 - 84 51 1010 0044FI-670-TV ≥ 60 ≥ 80 - Ø​5 40x40x106 - 84 50 1060 020FI-710-TV ≥ 60 ≥ 80 - Ø​5 40x40x106 - 84 50 1060 019FI-750-TV ≥ 60 ≥ 80 - Ø​5 40x40x106 - 84 50 1060 017FI-780-TV ≥ 60 ≥ 80 - Ø​5 40x40x106 - 84 50 1060 002FI-810-TV ≥ 60 ≥ 80 - Ø​5 40x40x106 - 84 50 1060 003FI-850-TV ≥ 60 ≥ 80 - Ø​5 40x40x106 - 84 50 1060 009FI-920-TI ≥ 60 ≥ 80 885-960 Ø​5 58x58x125 70x58x8 84 50 1061 001FI-950-TI ≥ 60 ≥ 80 915-990 Ø​5 58x58x125 70x58x8 84 50 1061 002FI-980-TI ≥ 60 ≥ 80 940-1020 Ø​5 58x58x125 70x58x8 84 50 1061 003FI-1060-TI ≥ 60 ≥ 80 1000-1080 Ø​5 58x58x125 70x58x8 84 50 1061 004Germany-Phone: +49 (0) 551/ 6935-0 France-Phone: +33 - 47 25 20 420643

5mm Aperture Two Stage Faraday Isolators (tunable),​DLI-SeriesTunable Diode Laser Isolators DLI• Tunable with maximum isolation over​the complete wavelength range• Two coupled isolator stages in series• Especially high Isolation > 60 dB• TGG crystal• Rare earth magnet• Input polarization = output​polarization• Individually calibrated adjustment​curve supplied with each isolator• Mounting:via four M4 threaded holes​at thebottom side and at the back​side;40 x 40 mm separation, or via​baseplate• Base plate included• Special version for injection lockingon​request• Damage thresholds > 2 kW / cm 2 cw​(488 / 514 nm)• Damage thresholds > 200 mJ / cm 2 for​pulses of 10 ns (1064 nm)• Damage thresholds > 28 mJ / cm 2 for​pulses of 280 fs (850 nm, 20 Hz)A closer lookAn easy integration of DLI Isolators is possible. They can be adjustedeasily without changing laser polarization or beam position. The outerwindow can be used for injection locking.Diode Laser Isolators DLIProductIsolation,​guaranteed​(dB)Transmission atdesign ​wavelength(%)Tuning range ​typical(nm)A​pe​rt​ur​e​(m​m)Dimensions​Isolator​(mm)Dimensions baseplate​(LxWxH)(mm)Order-NoDLI 1 ≥ 60 ≥ 80 754-890 Ø5 50x50x95 50x60x10 84 50 1003 000DLI 2 ≥ 60 ≥ 80 610-700 Ø5 50x50x95 50x60x10 84 50 1002 000DLI 3 ≥ 60 ≥ 80 650-760 Ø5 50x50x95 50x60x10 84 50 1001 000644US-Phone +1 585 223-2370 UK-Phone +44 2380 744 500