Laser-difference-frequency discriminator

Details Laser-difference-frequency discriminator Laser-difference-frequency discriminator

2005-11-01

2005-11-01

Pihulic, Daniel (Department: 3662)

Optics: measuring and testing

By light interference

Having partially reflecting plates in series

C250S227230

Statutory Invention Registration

active

H0002130

ABSTRACT:
A laser difference frequency discriminator that detects the difference between two laser frequencies and outputs a voltage near baseband that is related to the difference frequency. This discriminator power splits a laser beam containing the two laser frequencies into two paths, one which is sent down a delay line to a photo detector while the other is sent directly to a photodiode; there may be an optional phase shifter in either path. The relative phases of the heterodyne signals from the photo detectors are compared in a phase detector, its output voltage is related to the phase difference, which is, in turn, related to the difference frequency. This discriminator has applications in microwave generation, laser radar, and optical communications.

REFERENCES:
patent: 2002/0080367 (2002-06-01), Asami

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