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THORLABS LDM9T, User Manual

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LDM9T

 

Chapter 8: Specifications 

Page 16

 

15827-D02

 

Physical Specifications 

Laser Polarity Select 

Internal Slide Switches 

Laser Interface 

DB9 Female 

Power Supply Connector 

2.5 mm Power Jack 

RF Input Connector 

SMA Jack 

Interlock Connector 

2.5 mm Phono Jack 

Indicators 

LD Enabled, Power On Green LED 

Size (L x W x H) 

3.09" x 2.89" x 1.79" 

(78.4 mm x 73.3 mm x 45.5 mm) 

Weight 

0.56 lbs (1.55 lbs ship weight) 

Mounting Threads 

3x #8-32 (3x M4-0.7 for LDM9T/M) 

 

 

 

Summary of Contents for LDM9T

Page 1: ...LDM9T Laser Mount with TEC and Controller User Guide ...

Page 2: ... Control 7 4 5 Thorlabs LDC Series Laser Controller Connection 7 4 6 Using a Third Party Laser Controller 8 Chapter 5 Operation 9 5 1 General 9 5 2 RF Modulation 9 5 3 Status and Interlocks 10 5 4 Active Cooling System 10 5 5 Safe Operating Area SOA 11 5 6 Maintaining the LDM9T 12 Chapter 6 Making Safety Interlock Connections 13 Chapter 7 Trouble Shooting 14 Chapter 8 Specifications 15 Chapter 9 M...

Page 3: ...irect 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 H...

Page 4: ...turer Connecting the LD driver to mount with incorrect installation may damage the laser diode WARNING The RF input is directly coupled to the laser Any excessive transients or noise will be coupled into the laser and may cause the laser to be overdriven Also the laser can be easily overdriven if excessive RF power is applied to this input Use the RF modulation input with care to avoid damaging yo...

Page 5: ...ture platform for laser diodes This combined with current control can be used to stabilize or tune the laser diode wavelength The LDM9T is compatible with Thorlabs series of LDC controllers A four pin socket accepts all Ø9 mm TO 9 and Ø5 6 mm TO 56 laser diodes packages Easy to use polarity switches allow the laser mount to be configured for the laser pin assignments shown in the image below The l...

Page 6: ...DM9T Chapter 3 Description Page 4 15827 D02 Figure 1 Supported Pin Configurations 3 1 Package Contents LDM9T Mount Ø9 mm LD Flange Ø5 6 mm LD Flange Replacement Screws HK564 5 64 Hex Key Operating Manual ...

Page 7: ...Polarity Switch Settings The four sockets comprising the laser diode connector are through hole type sockets 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 pin will be isolated from the case The LDM9T was designed to operate the laser case at ground potential therefore this common pin will be insert...

Page 8: ...so to ground By noting which polarity pins are inserted in the socket you can convert the 4 pin layout to one of the 3 pin layouts in Figure 2 on page 5 Set the LD and PD polarity switches accordingly 4 3 Laser Diodes without a Monitor Photodiode Laser diodes without a monitor photodiode will also work with the LDM9T The laser diode pins must be positioned between the LD and G positions Some 2 pin...

Page 9: ...he TEC control provided will not be used It may be necessary to adjust the protection settings to allow operation without the TEC protection provided by the ITC Appropriate cables are included with our controllers and ensure that the controllers cannot be connected incorrectly The nomenclature for the Laser Diode polarity switch on the LDC40xx and ITC40xx drivers and the LDM9T are consistent with ...

Page 10: ...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 anode of the laser diode and photodiode 4 Photodiode Anode This pin is connected to the 12 o clock pin on the laser socket when the PD polarity switch is set to CG cathode grounded It is attached to ground and the 9 o clock and 3 o clock pins ...

Page 11: ...page 11 5 2 RF Modulation The LDM9T has an RF input for modulating the laser with an external RF source from 200 kHz to 1 GHz This is a 50 Ω input that is AC coupled directly to the laser through the Bias T 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 RF...

Page 12: ... be active and the laser controllers interlocking features must be implemented to provide the required safety protocols Below is a schematic of the interlock feature Figure 5 Interlock Connection Schematic If you wish to make full use of all of the Status and Interlock features with your third party drivers please contact Thorlabs and an engineer will help you determine if this is possible and how...

Page 13: ...termine how much power the mount can efficiently remove and maintained proper stabilization Most low and medium power laser diodes will fall within this curve To calculate the thermal power of the installed laser diode two factors need to be known forward operating voltage VF and the operating current Iop Both are typically published in all laser diode spec sheets 𝑃𝑡ℎ𝑒𝑟𝑚𝑎𝑙 𝑉𝐹 𝐼𝑜𝑝 Blue and violet l...

Page 14: ... D02 5 6 Maintaining the LDM9T There are no serviceable parts in the LDM9T The housing may be cleaned by wiping with a soft damp cloth If you suspect a problem with your LDM9T please call Thorlabs and an engineer will be happy to assist you ...

Page 15: ... wish to make use of the interlock feature you will need to acquire the appropriate connector mate and wire it to your remote interlock switch Next remove the shorting device by unscrewing it from the input and install the connector into the interlock input The interlock feature does not directly control the laser connections It only affects the interlock lines on pins 1 and 5 for the laser contro...

Page 16: ...full contact with the copper cold plate LD is mode hopping The laser diode may be operating on a mode transition Try adjusting the temperature to shift the laser diode to a more stable operating point Mount is set outside safe operation area Verify the thermal power of the laser diode is operating within the SOA as described in Section 5 5 page 11 The LDC Series Laser Driver Indicates an Open Circ...

Page 17: ...Impedance 50 Ω Maximum RF Power 250 mW Maximum TEC Current 1 A Internally Regulated TEC Heating Cooling Capacity 0 5 W Tambient 25 C TLD 20 C See SOA Curve page 12 Typical Temperature Range 20 to 30 C Temperature Stability 0 02 C 1 hour 0 05 C 24 hour Typical Settling Time 2 min heating 3 min cooling Temperature Sensors 10 kΩ Thermistor 2 25 C NTC Operating Temperature 10 to 30 C Storage Temperatu...

Page 18: ...Laser Interface DB9 Female Power Supply Connector 2 5 mm Power Jack RF Input Connector SMA Jack Interlock Connector 2 5 mm Phono Jack Indicators LD Enabled Power On Green LED Size L x W x H 3 09 x 2 89 x 1 79 78 4 mm x 73 3 mm x 45 5 mm Weight 0 56 lbs 1 55 lbs ship weight Mounting Threads 3x 8 32 3x M4 0 7 for LDM9T M ...

Page 19: ...LDM9T Chapter 8 Specifications Rev G Jan 22 2017 Page 17 Typical Temperature Response Times Figure 8 Typical Heating Response Figure 9 Typical Cooling Response ...

Page 20: ...he RF modulator should be connected to the LD controller Figure 10 shows the performance using the LDC202C Above 200 kHz the modulator should be connected to the mount s SMA connector The mount has been tested up to 1 GHz see Figure 11 below Figure 10 Low Frequency Modulation Through LD Controller Figure 11 RF Modulation Through SMA Connector on LM9LP ...

Page 21: ...LDM9T Chapter 9 Mechanical Drawing Rev G Jan 22 2017 Page 19 Mechanical Drawing ...

Page 22: ... 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 Responsibility If you do not re...

Page 23: ...South America Thorlabs Inc sales thorlabs com techsupport thorlabs com Europe Thorlabs GmbH europe thorlabs com France Thorlabs SAS sales fr thorlabs com Japan Thorlabs Japan Inc sales thorlabs jp UK and Ireland Thorlabs Ltd sales uk thorlabs com techsupport uk thorlabs com Scandinavia Thorlabs Sweden AB scandinavia thorlabs com Brazil Thorlabs Vendas de Fotônicos Ltda brasil thorlabs com China Th...

Page 24: ...www thorlabs com ...

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