THORLABS LDM21 Manuel utilisateur

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LDM21(/M)

5.6mm/9mm

LaserDiodeMount

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UserGuide

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TableofContents

Chapter1

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Safety...................................................................1

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Chapter2

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Description...........................................................2

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Chapter3

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Setup....................................................................3

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3.6.1

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TheoreticalResistanceValues............................................10

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Chapter4

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Operation...........................................................12

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Chapter5

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Troubleshooting.................................................14

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Chapter6

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Specifications.....................................................16

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Chapter7

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MechanicalDrawing...........................................17

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Chapter8

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WarrantyandRMAInformation.........................18

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Chapter9

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ThorlabsWorldwideContacts............................19

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5.6mm/9mmLaserDiodeMount Chapter1:Safety

Rev.L,March23,2023  Page1

Chapter1 Safety

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Warning

This unit must not be operated in explosive

environments.

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Warning

Avoidexposure–laserradiationemittedfromapertures

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5.6mm/9mmLaserDiodeMount Chapter2:Description

Page2  TTN013394‐D02

Chapter2 Description

TheLDM21(/M)isatemperature‐controlled laser diode mount. When

usedwithThorlabsLDCSeriesLaserControllersandTEDSeriesTEC

Controllers, a laser diode can be operated with precise temperature

controlforwavelengthandpowerstability.Afourpinsocketacceptsall

9mmand5.6mmlaserdiodes.Easytousepolarityswitchesallowthe

lasermounttobeconfiguredforallpossiblelaserpinassignments.

TheLDM21(/M)wasdesignedwithfeaturesthatallowittobeeasily

incorporatedintocomplexsystems.ThefrontoftheLDM21(/M)hasan

SM1(1.035"‐40)threadtoacceptawide variety of Thorlabs SM11.0"

opticsmountsandaccessories.Alsostandardwiththemountare4‐40

tappedholeson 30mmcentersformountinganynumberofThorlabs

cageassemblyproducts.Therearealsofour8‐32(M4x0.7)tappedholes

toallowtheunittobepostmounted.

TheLDM21(/M)usesathermo‐electriccooler(TEC)topreciselyregulate

the operating temperature of a laser diode. Temperature sensingis

accomplished using an integrated thermistor and AD592 solid state

temperaturesensor.TheThorlabsTED200Csupportsthesesensors.

NOTE:TheLDM21(/M)isintendedforlaserdiodesrequiringlowinput

power and operating across a limited temperature range.  Its primary

functionis tomaintainthelaserdiode casetemperatureataconstant

temperature to within 0.2 °C, ideally at 25 °C in a typical laboratory

ambientenvironment(20to30°C).PleaserefertotheSafeOperating

AreachartinthismanualtoensurethattheLDM21(/M)isusedwithinits

capabilities.

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Figure1 InsideViewofLDM21andIncludedComponents

5.6mm/9mmLaserDiodeMount Chapter3:Setup

Rev.L,March23,2023  Page3

Chapter3 Setup

LaserInstallation

1. Unpackthelasermountandremovethefour2‐56socket‐head

screwsfromthefrontcoverusinga5/64"hexdriver(provided).

2. Remove the two Phillips head 2‐56 screws from the laser‐

mountingflangeandremovetheflange.

3. Determine the laser pin configuration from the laser diode

manufacturer’sdatasheetsandsettheLD(LaserDiode)andPD

(Photodiode)switcheslocatedontheinsideoftheunitaccording

toFigure2.

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Figure2 PolaritySwitchSettings

Style A

Style B

Style C

Style D

AG CG

CG AG

AG CG

CG AG

AG CG

CG AG

AG CG

CG AG

Case

LD PD

Case

5.6mm/9mmLaserDiodeMount Chapter3:Setup

Page4  TTN013394‐D02

 The four sockets comprising the laser diode connector are

through‐hole type sockets with a blind clearance of 0.48”

(1.22cm)measuredfromthefrontfaceofthecoppercoldplate.

Itisnotnecessarytotrimthelaserdiodeleadspriortomounting

intothisconnectorunlesstheyarelongerthan0.48”(1.22cm).

 Thelaserconnectorislocatedcloseenoughtothefrontfaceof

thecoppercoldplatetoalloweasyinstallationofshort‐leaded

lasers. The clearance area around the LD and PD sockets is

sufficienttopreventthepinsfromcontactingthecoldplate.

 Mostlaserdiodesarethreepinswiththecasetiedtooneofthe

laserpinsandalsotooneofthephotodiodepins.Theotherlaser

and photodiode pins will be isolated from the case. The

LDM21(/M) was designed to operate the laser case at ground

potential,thereforethiscommonpinwillbeinsertedintoeither

the12o’clockorthe6o’clockpositionofthelaserconnector.

Locatetheisolatedlaserpinandinsertitinthe3o’clockposition.

Theisolatedphotodiodeshouldnowbeinthe9o’clockposition.

Refer to Fig. 3. (Orient the mount with the PD polarity switch

abovetheLDsocket).

 TheLDM21(/M)MountisalsocompatiblewithstyleEandstyle

Hlaserdiodes,whichdonothaveaphotodiode;theyhaveonly

alaserdiodeandagroundpin.Theycanthereforebesetupthe

same as style A (LD Anode Ground) or style B (LD Cathode

Ground)respectively.

 Replace the laser mounting flange and the cover. Install both

screwsthroughthemountingflangeandlooselyintothemount.

Carefullytighteneachscrewalittlebitatatimeuntiltheflange

isjustsnug.Donotover‐tighteneitherscrew‐theflangeshould

sitslightlyabovethecoldplate.Reinstallthecoverusingthefour

2‐56capheadscrewsprovided.

5.6mm/9mmLaserDiodeMount Chapter3:Setup

Rev.L,March23,2023  Page5

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Figure3 LDandPDOrientation

5.6mmAdapter

Bydefault,theLDM21(/M)isdesignedtobeusedwithstandard9mm

laserdiode packages.Themountcanbeusedwithastandard 5.6mm

using the included adapter, which can be found in the small brown

envelopemarked“Accessories”ontheoutside.Includedinthisenvelope

isthe9mmmountingplateandtheimperialtometricmountingadapter.

4‐PinLaserDiodes

TheLDM21(/M)alsosupports4‐pinlaserdiodes.Insertthelaserintothe

4‐pinsocketandnotewhichlaserpinisinthe3o’clockposition(laser

anodeorcathode). Also note whichphotodiode pin is inthe9 o’clock

position(anodeorcathode).Themountwilltiethelaserandphotodiode

pinslocatedat12o’clockand6o’clocktogetherandalsotoground.By

notingwhichpolaritypinsareinsertedintothesocket,youcanconvert

the4‐pinlayouttooneofthe3‐pinlayoutsinFigure2onpage3.Setthe

LDandPDpolarityswitchesaccordingly.

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LDPD

5.6mm/9mmLaserDiodeMount Chapter3:Setup

Page6  TTN013394‐D02

LaserControllerConnections

UsingtheThorlabsLDC/ITCSeriesLaserControllers:

 TheLDM21(/M)iscompatiblewithallThorlabsLDCLD

controllersandITCseriescombinationcontrollers(LDandTEC).

Appropriate cables with DB9 connectors are included with

Thorlabs controllers and ensure that the controllers cannot be

connectedincorrectly.Additionally,thesecontrollershavebuilt‐

inprotectioncircuitrythatprotectsthelaserwhennotinuse.

 ThenomenclaturefortheLaserDiodepolarityswitchonthe

LDC/ITC driver and the LDM21(/M) are consistent with each

other.Forexample,ifthelaserpolarityonthedriverissetto

“AG” (anode grounded), then the LD polarity switch on the

LDM21(/M)shouldalsobesettoAG,andsoforth.

 ThenomenclatureforthePhotoDiodepolarityswitchonthe

LDC4000SeriesBenchtopControllers,PRO8LaserDiodeCurrent

ControlModules,andITCseriesdriversandtheLDM21(/M)isas

follows:ThephotodiodepolarityswitchontheLDM21(/M)must

alwaysbesetto“CG”.Thephotodiodepolarityshouldbesetwith

theinternalLasercontrollerswitchonly.Formoreinformation

onhowtosetPolaritysettingsontheLasercontroller,please

refertotheappropriateLaserControllermanual.

Usingathird‐partylasercontroller:

 Whenusingathird‐partycontroller,acustomcablewillhaveto

bemadetoproperlyinterfacetothelasermount.Pleasereferto

thetableonthenextpageforlaserconnections:



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