Coherent light generators – Particular pumping means – Pumping with optical or radiant energy
Patent
1997-04-11
1999-07-20
Bovernick, Rodney
Coherent light generators
Particular pumping means
Pumping with optical or radiant energy
H01S 3091, H01S 3092
Patent
active
059264942
ABSTRACT:
A system and a method of pumping a gain medium element in one or more stages of a laser amplifier or oscillator with a spatially inhomogeneous optical pump beam, to minimize the potential for parasitic oscillation modes and amplified spontaneous emissions. The method is preferably accomplished by generating a spatially modulated optical pump beam, and pumping the gain medium element with the spatially modulated optical pump beam, to optically fragment the gain medium element into discontinuous amplifying gain regions, thereby creating a very lossy configuration for undesirable lateral modes, while maintaining a high-gain path for the desired longitudinal mode of operation. If there is more then one amplifier stage, the substantially identical optical pump beams are used in each stage and the gain regions of one gain medium element are spatially mapped onto the gain regions of the subsequent gain medium element. The spatially modulated optical pump beam may be generated by passing an input pump beam through an optical phase mask element.
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Bovernick Rodney
Duraiswamy V. D.
Hughes Electronics Corporation
Sales M. W.
Wise Robert E.
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