Phase conjugate laser
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United States of America Patent
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Jul 16, 1991
Grant Date -
N/A
app pub date -
Aug 17, 1990
filing date -
Aug 17, 1990
priority date (Note) -
Expired
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Abstract
A laser having a phase conjugating reflector positioned with a resonant cavity of a laser configuration capable of multimode operation. The resonant cavity or other means associated with the laser configuration selects the preferred mode at threshold. The phase conjugating material builds up reflectivity as the light intensity is increased above threshold power levels to maintain the selected mode to high power levels. One embodiment has an external Talbot cavity with a first mirror in a Talbot plane of a multi-emitter laser array and with the phase conjugating material at a sub-Talbot plane. Another embodiment has an external GRIN lens cavity with a far field apertured stripe mirror for threshold mode selection. The phase conjugator is placed at a high light intensity position within the cavity such as adjacent to the stripe mirror or adjacent to the laser array. The laser source may be a linear laser diode array or a 2-D surface emitting laser array. An additionl embodiment uses a diode-array-pumped solid state laser medium together with a phase conjugator between the cavity mirrors.
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