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

Chapter 3
Modulation Input
Current Set Point
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.
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Laser Diode Driver Module Operation

Figure 22 - Constant Current - Low Bandwidth Mode

Modulation Input
Current Set Point
-
+
Photodiode Input Amp

Figure 23 - Constant Power Mode

Unregulated DC
Voltage
Regulator
Pass
Transistor
Output
Shorting
Laser Diode
Current
Sense
Unregulated DC
Voltage
Regulator
Pass
Transistor
Output
Shorting
Laser Diode
Current
Sense
43