Current Monitoring Theory We prefer to measure current going through the laser diode rather than the voltage across it. The voltage as measured across the diode is difficult to filter for the noise present in the signal. Using the installed current monitoring circuit (J2) The PCO-7125 contains a group of very low value resistors in…
The PCO-7125 is designed to operate safely into an open so it won’t be damaged if the diode opens during operation or if the unit is operated without a diode attached.
The PCO-7125 requires two support voltages: +12 VDC at 80 mA High voltage supply of +50 to +200 V at 125 mA or 25 watts.
The benefit of using a gate input with an impedance of 50 Ohms is that a low-input impedance reduces false triggering from noise. If you’d like to convert the PCO-7125 gate input to high-impedance, you can remove R15 and R19 (100Ω resistors in parallel). However, this configuration may result in unpredictable pulse output.
The ideal pulse shape for many applications is a perfect square… here’s why the edges are not perfectly square: The PCO-7125 “rise time” and “fall time” specification is <17 ns typical as measured from 10% to 90% of the full waveform. That means the rise time and fall time is measured between two points on…
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To minimize the laser diode’s response time to a pulse, the PCX-7420 can deliver current pulse in two steps. The first step is the bias pulse, which starts before the intended trigger time. The idea is to set the bias current just below the laser diode trigger point (the current can be set from 1…