Low-noise frequency-multiplied laser

Details Low-noise frequency-multiplied laser Low-noise frequency-multiplied laser

1998-09-02

2000-10-31

Scott, Jr., Leon

Coherent light generators

Particular resonant cavity

Plural cavities

372 22, 372 27, 372 92, 372108, 372 98, H01S 3082

Patent

active

061413690

ABSTRACT:
An intracavity frequency-doubled laser has a standing-wave resonator including a gain medium and an optically-nonlinear crystal. The optically-nonlinear crystal has a large walkoff-angle between the fundamental laser-beam and the frequency-doubled beam created by passage of the fundamental laser-beam through the crystal. The optically-nonlinear crystal is arranged such that the walkoff-angle provides for lateral, spatial separation of a fundamental and a corresponding frequency-doubled beam outside the crystal, and for separation of counterpropagating frequency-doubled beams from each other. The spatial separation of the counterpropagating frequency-doubled beams reduces amplitude fluctuation caused by interference between the beams. A physical stop is used to prevent one of the frequency-doubled beams from entering the gain medium. This prevents that beam from spuriously pumping the gain medium and thus serves to further reduce amplitude fluctuation.

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T. Kellner, F. Heine & G. Huber, "Efficient laser performance of Nd:YAG at 946 nm and intracavity frequency dougling with LiJO.sub.3, .beta.-BaB.sub.2 O.sub.4, and LiB.sub.3 O.sub.5," Applied Physics B, vol. 65, No. 6, Dec. 1977, pp. 789-792.

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