Coherent light generators – Particular pumping means – Pumping with optical or radiant energy
Patent
1997-08-04
1999-07-20
Lee, John D.
Coherent light generators
Particular pumping means
Pumping with optical or radiant energy
372 70, H01S 30933
Patent
active
059264950
ABSTRACT:
A laser diode pumped laser has a laser diode wavelength sensing and control apparatus. A laser medium is mounted in a laser cavity and has a laser diode pump having a laser diode or laser diode array having an output of a predetermined wavelength for exciting the laser medium. An optical radiation detector is coupled to the output of the laser medium to receive and measure the radiation from the laser diode transmitted through the laser medium and a detector bias and signal measurement circuit is coupled to the optical radiation detector to receive signals therefrom and generate an output signal responsive to the optical radiation detector signals and to apply the generated signals to the laser diode power supply (or to diode heaters) to vary the power supply output to vary the laser diode wavelength to maintain the laser diode wavelength at the absorption peak of the laser medium. A method of sensing and controlling the laser diode pump wavelength for a laser includes selecting a laser in accordance with the apparatus and coupling the selected detector bias and signal measurement circuit to the optical radiation detector to receive signals therefrom and generate output signals responsive to the optical radiation detector signals and coupling the radiation bias in the signalling measuring circuit to the laser diode power supply to vary the diode power supply output to vary the laser diode wavelength to maintain the output near the absorption peak of the laser medium.
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Hobby III William M.
Lee John D.
Litton Systems Inc.
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