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Summary of Contents for THORLABS LD2000R
- Page 1 LD2000R OEM Laser Diode Driver with Analog Modulation User Guide...
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Page 2: Table Of Contents
4.2. Limit Current Circuit ............4 4.3. Constant Power Feedback Loop ........4 4.4. Theory of Operation ............6 Chapter 5 Operating the LD2000R ............ 8 5.1. Setup ................8 5.2. Setting the Feedback Resistor ........10 5.3. Operating Modes ............11 5.3.1. -
Page 3: Chapter 1 Warning Symbol Definitions
OEM Laser Diode Driver Chapter 1: Warning Symbol Definitions 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... -
Page 4: Chapter 2 Safety
OEM Laser Diode Driver Chapter 2: Safety Chapter 2 Safety All statements regarding safety of operation and technical data in this instruction manual will only apply when the unit is operated correctly. SHOCK WARNING Warning is given when there is danger of injury to users. CAUTION Caution is given when there is a possibility of damage to the product. -
Page 5: Chapter 3 Description
The LD2000R supports a wide range of laser diodes with drive currents up to 100 mA and photodiode currents from 20 µA to 2 mA. The LD2000R also has an external modulation input to support applications that require modulating the laser output. -
Page 6: Chapter 4 Ld2000R Overview
OEM Laser Diode Driver Chapter 4: LD2000R Overview Chapter 4 LD2000R Overview The LD2000R is composed of three independent circuits: slow start circuit, limit current circuit, and output control circuit. Each is described below. 4.1. Slow Start Circuit The slow start circuit is used to monitor the supply voltage and keep the laser output off until the power supply stabilizes. - Page 7 OEM Laser Diode Driver Chapter 4: LD2000R Overview this limits the maximum photodiode current to 125 µA. This upper limit can be easily increased by adding an external resistor (see page 15). The setpoint voltage used by the feedback loop is the difference between the PD CURRENT SETPOINT voltage and the Analog Modulation Voltage as follows: ��...
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Page 8: Theory Of Operation
Chapter 4: LD2000R Overview 4.4. Theory of Operation The LD2000R uses the internal monitor photodiode provided on most low power diode lasers for feedback when operating in the Constant Power Mode. The following figure is a block diagram of the LD2000R laser driver. - Page 9 OEM Laser Diode Driver Chapter 4: LD2000R Overview The LD2000R has an internal transimpedance gain of 20 k. Without a user installed feedback resistor, the transimpedance gain is: �� = 20 ��٠�� and V is equal to: Error ( ��...
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Page 10: Chapter 5 Operating The Ld2000R
The pinouts for the LD2000R are provided in Figure 1 and described below. The LD2000R can be used with A, D, or F style diodes. The D and F style diodes will need to be configured like an A style diode (see page 3 for diagrams). - Page 11 OEM Laser Diode Driver Chapter 5: Operating the LD2000R Name Description These pins are provided for connecting an external capacitor to the control loop integrator to extend the integrator time constant. This may be necessary to get maximum bandwidth when using TTL modulation.
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Page 12: Setting The Feedback Resistor
Chapter 5: Operating the LD2000R 5.2. Setting the Feedback Resistor The LD2000R is configured at the factory for a maximum feedback gain. This gain setting is appropriate for lasers that have low monitor currents in the range of 20 to 120 A. -
Page 13: Operating Modes
5.3.1. CW Operation To operate the LD2000R in a CW mode, follow the steps below. Connect your laser diode to the appropriate pins (11, 12, 13) Attach a suitable DC voltage supply to pins 9 and 10. The power supply should be bypassed near the LD2000R with a 10 µF tantalum capacitor... -
Page 14: External Modulation Operation
The graph above describes the characteristic of the modulation voltage. If the LD2000R is set up to match a particular laser, the solid curve would represent the output power of the laser as a function of the modulation voltage. A couple of notes... - Page 15 OEM Laser Diode Driver Chapter 5: Operating the LD2000R The turn-off voltage is dependent on matching R fext the laser. If the feedback gain is too high, the laser will turn off at a lower voltage where RF=R F EXT...
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Page 16: Chapter 6 Specifications
OEM Laser Diode Driver Chapter 6: Specifications Chapter 6 Specifications Specification Value Current Output Limit Current Control Trimpot or External Analog Voltage Limit Current Range 0 to 100 mA Limit Accuracy ±1% �� ) − 5�� Compliance Voltage ���������� Power Output Photodiode Current Control Trimpot or External Analog Voltage 20 to 125 A (Factory Configured... -
Page 17: Chapter 7 Mechanical Drawing
OEM Laser Diode Driver Chapter 7: Mechanical Drawing Chapter 7 Mechanical Drawing Figure 4 LD2000R Mechanical Drawing Rev I, May 21, 2018 Page 15... -
Page 18: Chapter 8 Regulatory
Waste Treatment is Your Own Responsibility If you do not return an “end of life” unit to Thorlabs, you must hand it to a company specialized in waste recovery. Do not dispose of the unit in a litter bin or at a public waste disposal site. -
Page 19: Chapter 9 Thorlabs Worldwide Contacts
: Thorlabs Worldwide Contacts Chapter Thorlabs Worldwide Contacts For technical support or sales inquiries, please visit us at www.thorlabs.com/contact for our most up-to-date contact information. USA, Canada, and South America UK and Ireland Thorlabs, Inc. Thorlabs Ltd. sales@thorlabs.com sales.uk@thorlabs.com techsupport@thorlabs.com... - Page 20 www.thorlabs.com...
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