Newport 5600 Series - Constant Power Mode; Figure 16 - Constant Power Mode; Internal Modulation; Pulse Generator

38 Chapter 4 Principles of Operation
4.2.11 Constant Power Mode
In constant P mode the laser circuit is configured as shown in Figure 16.
Detector feedback is used to control the laser output and the bandwidth is
held low.
Internal
Modula t i on
Regul at ed
S
upply
Modulation Input
Current Set Point
Laser Diode
Out put
Shorting
Current
Sense
Pass
Transistor
Det ect or
Input
Figure 16 - Constant Power Mode
4.2.12 Internal Modulation
A sine or square wave function generator can be selected for internal
modulation. The frequency is controlled by the frequency DAC’s output and
the sine or square function is controlled by a digital signal.
4.2.13 Pulse Generator
The pulse generator consists of a frequency source and a duty cycle
modifier. The pulse signal grounds or opens the set point signal to form the
pulse.
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