Laser control apparatus

Details Laser control apparatus Laser control apparatus

H - Electricity

01

S

345/39

H01S 3/098 (2006.01) H01S 3/131 (2006.01) H01S 3/139 (2006.01)

Patent

CA 1139869

ABSTRACT A laser control system using a resonant cavity of the type producing adjacent modes of opposite polarization and with mirrors mounted by a system having a non-zero thermal expansion coefficient. A beam splitter plate in the output beam provides two low intensity beams which are passed through film polarizers to provide beams proportional to the intensities of oppositely polarized adjacent modes. A detector is positioned in each low intensity beam and a differential amplifier is connected to the detectors. The output of the differential amplifier controls a heating coil around the resonant cavity which in turn controls the mirror spacing by varying the temperature of the mounting system. Thus, the radiation received at each detector is maintained equal and the adjacent modes stabilized. A further polarizer in the output path transmits the radiation at one of the modes.

343634

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