THORLABS LDM21 Manual de usuario

LDM21

5.6 mm/9 mm

Laser Diode Mount

User Guide

Table of Contents

Chapter 1Warning Symbol Definitions ........................................... 1

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

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

3.1.LaserInstallation...........................................................3

3.2.5.6mmAdapter.............................................................5

3.3.4‐PinLaserDiodes.........................................................5

3.4.LaserControllerConnections..........................................5

3.5.TECControllerConnections............................................6

3.6.ThermistorData............................................................7

3.7.MountingOtherAccessories..........................................9

Chapter 4Operation ......................................................................... 10

4.1.SafeOperatingArea....................................................10

4.2.MaintainingtheLDM21...............................................11

Chapter 5Troubleshooting ............................................................. 12

Chapter 6Specifications ................................................................. 13

Chapter 7Mechanical Drawing ....................................................... 14

Chapter 8Regulatory ....................................................................... 15

8.1.WasteTreatmentisYourOwnResponsibility...............15

8.2.EcologicalBackground.................................................15

Chapter 9Thorlabs Worldwide Contacts....................................... 16

LDM21 Chapter 1: Warning Symbol Definitions

Page 1 Rev K, September 11, 2018

Chapter 1 Warning Symbol Definitions

Below is a list of warning symbols you may encounter in this manual or on your

device.

Symbol Description

Direct Current

Alternating Current

Both Direct and Alternating Current

Earth Ground Terminal

Protective Conductor Terminal

Frame or Chassis Terminal

Equipotentiality

On (Supply)

Off (Supply)

In Position of a Bi-Stable Push Control

Out Position of a Bi-Stable Push Control

Caution: Risk of Electric Shock

Caution: Hot Surface

Caution: Risk of Danger

Warning: Laser Radiation

Caution: Spinning Blades May Cause Harm

LDM21 Chapter 2: Description

TTN013394-D02 Page 2

Chapter 2 Description

The LDM21 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 9mm and 5.6mm laser diodes. Easy

to use polarity switches allow the laser mount to be configured for all possible

laser pin assignments.

The LDM21 was designed with features that allow it to be easily incorporated into

complex systems. The front of the LDM21 has a 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 is also a #8-32 tapped hole

on the bottom surface to allow the unit to be post mounted.

The LDM21 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 TED200 supports these sensors.

NOTE: The LDM21 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 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 is used within its

capabilities.

Figure 1 Inside View of LDM21 and Included Components

LDM21 Chapter 3: Setup

Page 3 Rev K, September 11, 2018

Chapter 3 Setup

3.1. 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.

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

LDM21 Chapter 3: Setup

TTN013394-D02 Page 4

1. The four sockets comprising the laser diode connector are through-hole

type sockets with a blind clearance of 0.48” 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”.

2. 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.

3. 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 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).

4. The LDM21 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.

5. 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.

Figure 3 LD and PD Orientation

LDPD

LDM21 Chapter 3: Setup

Page 5 Rev K, September 11, 2018

3.2. 5.6 mm Adapter

By default, the LDM21 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.

3.3. 4-Pin Laser Diodes

The LDM21 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 above. Set the LD and PD polarity switches

accordingly.

3.4. Laser Controller Connections

Using the Thorlabs LDC/ITC Series Laser Controllers:

 The LDM21 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 are consistent with each other. For example, if

the laser polarity on the dirver is set to “AG” (anode grounded), then the

LD polarity switch on the LDM21 should also be set to AG, and so forth.

 The nomenclature for the Photo Diode polarity switch on the

LDC40xx/80xx and ITC series drivers and the LDM21 is as follows: The

photodiode polarity switch on the LDM21 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:

LDM21 Chapter 3: Setup

TTN013394-D02 Page 6

Pin Signal Description

1 Interlock

(LDC Specific)

This pin is the input to the Interlock Circuits. When using

Thorlabs LDCs, no external circuitry is required.

2 Photodiode

Cathode

This pin is connected to the 9 o’clock pin on the laser

socket when the PD Polarity Switch is set to AG (Anode

Grounded). It is attached to ground and the 12 o’clock and

6 o’clock pins on the laser socket when the PD Polarity

Switch is set to CG (Cathode Grounded).

3 Laser Ground

(Case)

This pin is connected to the 12 o’clock and 6 o’clock pins

on the laser socket and corresponds to the settings of the

LD and PD polarity switches. i.e., if the LD and PD

switches are set to AG, then this pin grounds the Anodes

of the laser and photo diode.

4 Photodiode

Anode

This pin is connected to the 9 o’clock pin on the laser

socket with the PD Polarity Switch is set to CG (Cathode

Grounded). It is attached to ground and the 12 o’clock and

6 o’clock pins on the laser socket when the PD Polarity

Switch is set to AG (Anode Grounded).

5 Interlock Return This pin is the return side of the Interlock circuitry. Pin 1

and 5 are shorted internally in the LDM21.

6 N/A

7 Laser Diode

Cathode

This pin is connected to the 3 o’clock pin on the laser

socket when the LD Polarity Switch is set to AG (Anode

Grounded). Otherwise, it is floating.

8 Laser Diode

Anode

This pin is connected to the 3 o’clock pin on the laser

socket when the LD Polarity Switch is set to CG (Cathode

Grounded). Otherwise it is floating.

9 N/A

3.5. TEC Controller Connections

Using the Thorlabs TED Series TEC Controllers:

 The LDM21 is best used with Thorlabs TED200 or related TEC

Controllers. The TED series are shipped with a mating DB9 cable that

plugs directly into the controller and laser mount. Using the cable

supplied with the TED, the controller cannot be connected incorrectly.

Simply connect the cable included with the TED to the Laser Mount and

to the controller.

Using a third-party TEC 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 to the

right for laser connections.

LDM21 Chapter 3: Setup

Page 7 Rev K, September 11, 2018

TEC Connector Pin Function

3.6. Thermistor Data

Figure 4 Thermistor Curve and Data

Pin Signal Description

1 N/A

2 +Thermistor The 10 kΩ @ 25 °C NTC thermistor (provided for

temperature feedback).

3 -Thermistor The thermistor return pin

4 +TEC This pin is connected to the positive terminal of the TEC

element.

5 -TEC (-) This pin is connected to the negativeterminal of the TEC

element.

6 N/A

7 AD592 (-)

The negative terminal of the AD592 temperature

transducer. When using Thorlabs TEDs, no external

circuitry is required. To use this device with third party

controllers, it must be properly biased. Refer to Analog

Devices AD592 Data for applications information.

8 N/A

9 AD592 (+) The positive terminal of the AD592

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