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What does your laser do? A laser pointer?erique82 said:i want to obtain the phase of laser waveform. i know that generally a PLL has a phase detector, so im wondering how to connect it to a laser diode drive circuit.
erique82 said:i want to obtain the phase of laser waveform. i know that generally a PLL has a phase detector, so im wondering how to connect it to a laser diode drive circuit.
audioguru said:An electronic circuit can't detect the phase of a light frequency. It is much too high.
Ron H said:If the beam energies are comparable, you can superimpose them on a photodetector that is sensitive to the laser's wavelength. Interference will cause the output of the detector to vary as a function of the phase between the two beams. I think. :roll:
if u need to just 'measure' this distance, it is better to go for ultrasound ranging methods .erique82 said:right you are. just a couple of feet will do.