Visual laser numerical control modulation driver circuit diagram

As shown in the figure, the laser tube drive circuit is often equipped with a photodiode, which can generate a current proportional to the laser beam intensity (optical power). However, the response of this type of photodiode is relatively slow and generally cannot track the modulation. The peak optical power of the laser tube. Therefore, this drive circuit controls the laser generator by monitoring the average optical power. The visible laser digitally controlled modulation driver circuit is shown in the figure. It includes a 10-bit analog-to-analog converter (DAC) with a 3-wire serial interface, used to control a visible laser tube to output a constant average optical power; a separate digital input Line (MOD), through a comparator (IC4) with an open-drain output and VTl, feed pulses to the laser diode VD1 to achieve digital communication.