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3.5.3.9 Ths ______________________________________________________________ 28
3.5.3.10 Vlas _____________________________________________________________ 28
3.5.3.11 Vf Loss __________________________________________________________ 29
3.5.3.12 Pulse Enable ______________________________________________________ 29
3.5.3.13 Pulse Width _______________________________________________________ 29
3.5.3.14 Pulse Rate ________________________________________________________ 29
3.5.3.15 Duty Cycle________________________________________________________ 29
3.5.3.16 PD Resp__________________________________________________________ 29
3.5.3.17 PD Zero __________________________________________________________ 29
3.5.4 Modulation Setup Menu ________________________________________________ 29
3.5.4.1 Modulation Enable (Mod Enable) ______________________________________ 30
3.5.4.2 Frequency (Freq)____________________________________________________ 30
3.5.4.3 Modulation Type (Mod Type) _________________________________________ 30
3.5.4.4 Modulation Amplitude (Mod Amp) _____________________________________ 30
3.5.4.5 Io min and Io max___________________________________________________ 31
4. Principles of Operation ____________________________________________33
4.1 Introduction______________________________________________________ 33
4.2 Laser Driver Theory of Operation ___________________________________ 33
4.2.1 Laser Interface _______________________________________________________ 34
4.2.2 Limit DAC __________________________________________________________ 35
4.2.3 Set Point DAC _______________________________________________________ 35
4.2.4 A/D Converter _______________________________________________________ 35
4.2.5 Current Source Voltage ________________________________________________ 35
4.2.6 Output Shorting_______________________________________________________ 35
4.2.7 Modulation Input Port__________________________________________________ 35
4.2.8 Photodiode Feedback Amplifier__________________________________________ 36
4.2.9 Constant Current, High Bandwidth Mode___________________________________ 36
4.2.10 Constant Current, Low Bandwidth Mode___________________________________ 36
4.2.11 Constant Power Mode__________________________________________________ 38
4.2.12 Internal Modulation ___________________________________________________ 38
4.2.13 Pulse Generator_______________________________________________________ 38
4.3 Microprocessor Board _____________________________________________ 39
4.3.1 Microprocessor_______________________________________________________ 39
4.3.2 Memory_____________________________________________________________ 40
4.3.3 Laser Interface _______________________________________________________ 40
4.3.4 Front Panel Interface___________________________________________________ 40
4.3.5 GPIB Interface _______________________________________________________ 40
4.3.6 RS-232 Serial Interface_________________________________________________ 40
4.4 Power Supplies ___________________________________________________ 40
4.4.1 LDD Power Supplies __________________________________________________ 40
4.4.2 CPU Supply _________________________________________________________ 41
4.5 Interlock Operation _______________________________________________ 41
4.5.1 Laser Interlock _______________________________________________________ 41
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