Monitoring and controlling radiation source stability

Details Monitoring and controlling radiation source stability Monitoring and controlling radiation source stability

H - Electricity

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315/24

H01S 3/137 (2006.01) G02F 2/00 (2006.01) H01S 3/139 (2006.01) H01S 5/00 (2006.01) H04B 10/155 (2006.01) H01S 5/0687 (2006.01)

Patent

CA 1320532

ABSTRACT OF THE DISCLOSURE A method and apparatus for locking the frequencies of a number of first beams of coherent radiation from respective sources are disclosed. Typically, the sources will form local oscillators in respective transmitters. The apparatus includes a reference beam generator such as a HeNe laser which generates a primary reference beam fed to an interferometer which generates a second, reference beam composed of a number of reference frequencies. This second reference beam is caused to interfere with each of the beams from the local sources in an optical coupler and the resultant beam is detected with a photodiode. The electrical output signal of the photodiode is filtered and fed to a discriminator which controls the frequency of the local laser. The discriminator controls the laser to maintain the relationship between the frequencies of the laser and the reference laser substantially constant.

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