Newport 8000 - Constant Power Mode; Figure 22 - Constant Current - Low Bandwidth Mode; Figure 23 - Constant Power Mode

Chapter 3 Laser Diode Driver Module Operation 43
Unregulated DC
Voltage
Regulator
Pass
Transistor
Modulation Input
Current Set Point
Laser Diode
Output
Shorting
Current
Sense
Figure 22 - Constant Current - Low Bandwidth Mode
3.6.11 Constant Power Mode
In constant P mode the laser circuit is configured as shown in Figure 23. Photodiode
feedback is used to control the laser output and the bandwidth is held low.
Unregulated DC
Voltage
Regulator
Pass
Transistor
Modulation Input
Current Set Point
Laser Diode
Photodiode Input Amp
+
-
Output
Shorting
Current
Sense
Figure 23 - Constant Power Mode
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