These modular laser diode controller driver cards feature laser diode driver and TEC temperature controllers and are used with our 8 and 16 card multi-channel modular laser diode controllers. The current source provides high stability output of up to 1.5 Amp with fully redundant current limits and multiple laser protection features. The built-in bi-polar temperature controller can work with thermistor type temperature sensors for precise laser temperature control over a wide range of temperatures. Other features of the TEC controller include TEC voltage measurement, digital selection of thermistor current range, and control loop gain adjustment from 1 to 127.
Combination driver/TEC modules with up to 1500mA / 9W TEC
Bi-polar current driver for precise temperature control
Control loop gain adjustment from 1 to 127
Multiple hardware current limits and laser protection features
Additional CAD file downloads are not available for this product.
16-channel-laser-diode-modules - Drawings
Additional drawings are not available for this product.
Specifications
Type
LDC-3908/3916 Controller Card
TE Current Range
-1.50 to +1.50 A
TE Voltage Range
-7.00 to +7.00 V
TE Output Power
9 W
Temperature Range
-99.9 to 199.9°C
Laser Current Accuracy
±0.1% of FS
Current Output 24 h Stability
50 ppm FS
Current Output 1 h Stability
20 ppm FS
External Modulation Low Bandwidth
30 kHz
Forward Voltage Accuracy
±7mV
Forward Voltage Resolution
10 mV
TEC Current 24h Stability
<±0.01°C
TEC Current 1h Stability
<±0.007°C
TEC Ripple/Noise (rms)
<1 mA
Photodiode Current Range
0 -5000 µA
Photodiode Current Resolution
0.1 µA
Features
Four-Wire Voltage Sense
These Modular Laser Diode Cards have a 4-wire voltage sense feature. The laser voltage is sensed through a pair of connections that is separate from the laser current drive connections. This allows a more accurate laser voltage reading for the voltage limit feature. All four of these pins must be connected for the module to operate.
Electrically Isolated Photodiode Connections
Many laser diode modules contain an internal photodiode that monitors the back-facet emission of the laser. Usually, this photodiode is internally connected to either the laser anode or cathode. The photodiode and laser connections to these cards are electrically isolated from ground and each other. So, if a 4-pin connection is made (no common connections), no additional jumpers are required.
Grounding Considerations
The laser outputs of these laser diode cards are isolated from chassis ground allowing either output terminal to be grounded at the user's option.
Powerful GPIB Interface
Newport's Modular Laser Diode Cards' response to sensing the various limits can be controlled via the GPIB interface. Most high limit responses can be set to either turn off the source or just give a limit warning through the GPIB interface.
Setting the Standard in Laser Diode Protection
Laser diodes are extremely sensitive to electro-static discharge, excessive current levels, current spikes, or transients from power surges or other laboratory equipment. One of the most important features we have implemented into each instrument is the ILX Lightwave proven laser diode protection standards. These standards have led to advanced protection features such as intermittent contact detection, adjustable compliance voltage limit, and 4-wire voltage measurement for precise laser diode forward voltage measurement. In addition, the current limit setting is independent of the voltage drop of the device connected to the laser output. Because the current limit circuitry is fully independent of the main current control, the current limit can be adjusted safely, even while the laser output is active. For more information about these protection features, please see our “Protecting Your Laser Diode" application note.
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