THORLABS LDM56 Operating Manual Download Page 6 | Manualshive

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THORLABS LDM56 Operating Manual Download Page 6

Temperature-Controlled Laser Diode Mounts

Chapter 3: Description

Page 4

TTN121126-D02

Figure 1

Location of Features

LD Switch

PD Switch

Laser On
Indicator

LD Driver
Connector

TEC Driver
Connector

Pin Code

Select Jumper

RF Input

(SMA))

Remote

Interlock

DIP Switches

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Summary of Contents for LDM56

Page 1: ...LDM56 M and LDM90 M Temperature Controlled Mounts for Ø5 6 and Ø9 mm Laser Diodes Operating Manual ...

Page 2: ...llers 8 4 3 2 Using a Third Party Laser Controller 8 4 4 TEC Controller Connection 10 4 4 1 Using the Thorlabs TED Series TEC Controllers 10 4 4 2 Using a Third Party TEC controller 10 4 5 Mounting Other Accessories 11 4 5 1 Mounting Thorlabs Fiber Coupled Pigtailed Lasers 11 4 6 Making the Safety Interlock Connections 12 Chapter 5 Operation 13 5 1 RF Modulation 13 5 2 Status and Interlocks 14 5 3...

Page 3: ...vice 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 Sp...

Page 4: ... Controlled Laser Diode Mounts Chapter 2 Safety Page 2 TTN121126 D02 Chapter 2 Safety WARNING This unit must not be operated in explosive environments WARNING Avoid exposure laser radiation emitted from apertures ...

Page 5: ...changed in the mount It is as simple as inserting the laser diode into the socket according to the imprinted pin assignment and fastening the mounting flange with two screws The diode socket is located very close to the front of the cold plate making the connection of short lead devices easier The LDM56 M and LDM90 M can be easily integrated into any existing optical setup The mounting options inc...

Page 6: ...Diode Mounts Chapter 3 Description Page 4 TTN121126 D02 Figure 1 Location of Features LD Switch PD Switch Laser On Indicator LD Driver Connector TEC Driver Connector Pin Code Select Jumper RF Input SMA Remote Interlock DIP Switches ...

Page 7: ...t as per the laser diode pin configuration provided by the manufacturer Connecting the LD driver to mount with incorrect installation will damage the laser diode WARNING Use of thermal grease is not recommended for use with the TO can laser diode mount Thermal grease will creep and eventually contaminate the laser facet To install the laser diode complete the following steps 1 Unpack the laser mou...

Page 8: ...r to the figure below Figure 3 LD and PD Orientation 4 Install the laser mounting flange and the cover Install both screws through the mounting flange and loosely into the cold plate then carefully tighten each screw a little bit at a time until the flange is just snug Do not over tighten either screw the flange will sit slightly above the cold plate If removed during installation reinstall the co...

Page 9: ...mper is set across the center and right pin for operation with G pin code laser diodes Figure 6 The G pin code setting grounds the photodiode pin which allows the mount to drive a laser diode only no photodiode configuration with the LD pin at the 12 o clock position 5 If the mount will be used with a G style laser diode unscrew the four captive 4 40 socket head screws from the front cover using a...

Page 10: ... on the LDC ITC driver and the LDM56 M and LDM90 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 LDM56 M and LDM90 M should also be set to AG and so forth The nomenclature for the photodiode polarity switch on the LDC40xx 80xx and ITC series drivers and the LDM56 M and LDM90 M is as follows The photodio...

Page 11: ... 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 diodes 2 Photodiode Cathode This pin is connected to the 6 o clock pin on the laser socket when the PD Polarity Switch is set to AG It is attached to ground and the 3 o clock and 9 o clock pins on the laser socket when the PD Polarity Switch is set to CG 4 Photodiode Ano...

Page 12: ...he positive terminal of the TEC element 5 TEC and TEC Lockout This pin is connected to the negative terminal of the TEC element and also is common to the cathode of the photo relay of the TEC Lockout circuit refer to the Status and Interlock section of this manual 1 TEC Lockout This pin is connected to the anode of the photo relay side of the TEC Lockout circuit When using Thorlabs TEDs no externa...

Page 13: ...bled form off the shelf products 4 5 1 Mounting Thorlabs Fiber Coupled Pigtailed Lasers Ensuring that the pins are correctly aligned mount the pigtail housing directly onto the cold plate as shown in Figure 8 below Note that these mounts are not optimized for use with pigtailed lasers so TEC performance and compatibility are not guaranteed If primarily using pigtailed lasers we suggest using the L...

Page 14: ... leave the shorting device installed and the unit will operate normally as described in the procedures in this manual If you wish to make use of the interlock feature you will need to acquire the appropriate connector mate and wire it your remote interlock switch Next remove the shorting device by pulling it from the input and install the connector into the interlock input The interlock input only...

Page 15: ...is a 50 Ω input that is AC coupled directly to the laser through a Bias Tee network To calculate the desired RF power to modulate the laser determine the amount of modulating current needed from the laser manufacturer s data sheets and use the following calculations 50 Ω LD Modulating Current It is strongly recommended that you start off conservatively by a factor of 10 below the calculated modula...

Page 16: ... open and is only needed if using a controller that is floating has no path to earth ground If third party controllers are used to drive the laser diode or TEC elements then only the LD ON indicator can be used To prevent damage to the Status and Interlock circuits the following external connections should be followed 1 Install the shorting device into the INTERLOCK connector that was shipped with...

Page 17: ...udes a 10 kΩ thermistor for temperature feedback We recommend setting the sensor type to Thermistor low when operating with a Thorlabs ITC or TED4xxx series controller The graph below shows the typical thermistor resistance versus temperature Full thermistor specifications can be found in Chapter 8 Figure 11 Thermistor Resistance vs Temperature ...

Page 18: ...TTN121126 D02 Chapter 6 Maintenance There are no serviceable parts in the LDM56 M and LDM90 M The housing may be cleaned by wiping with a soft damp cloth If you suspect a problem with your LDM56 M and LDM90 M please call Thorlabs and an engineer will be happy to assist you ...

Page 19: ...and a DPSS flange that is sold separately LDM56DJ The LDC series laser driver indicates an Open Circuit alarm when the laser is enabled The LD and PD polarity switch settings are incorrect Refer to Figure 2 and the data sheet for your specific laser diode to ensure the proper settings The LD polarity switch setting on your LDM56 M and LDM90 M must also match the LD polarity switch setting on the r...

Page 20: ...ser Interface DB9 Female TEC Specs Max TEC Current 5 A Max TEC Voltage 4 V TEC Heating Cooling Capacity 8 W Tambient 25 C Typical Temperature Range LD Dependent 0 to 70 C Temperature Sensor AD592AN 1 A K Thermistor 10 k 3 at 25 C NTC Beta 3977 K 0 75 TEC Interface DB9 Male General Size 4 00 x 4 00 x 2 07 101 6 mm 101 6 mm 52 6 mm Weight 1 9 lbs 0 87 kg Operating Temperature 10 to 40 C Storage Temp...

Page 21: ... Controlled Laser Diode Mounts Chapter 9 Drawing Rev C February 20 2018 Page 19 Chapter 9 Drawing Figure 12 Mechanical Diagram of LDM56 M and LDM90 M Mounts Imperial Mounting Holes 1 4 20 Metric Mounting Holes M6 ...

Page 22: ...to other Thorlabs products such as Pure OEM products that means assemblies to be built into a unit by the user e g OEM laser driver cards Components Mechanics and optics Left over parts of units disassembled by the user PCB s housings etc If you wish to return a Thorlabs unit for waste recovery please contact Thorlabs or your nearest dealer for further information Waste Treatment is Your Own Respo...

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