Grating tuned unstable resonator laser cavity

Details Grating tuned unstable resonator laser cavity Grating tuned unstable resonator laser cavity

1980-08-06

1982-11-30

Sikes, William L.

Coherent light generators

Particular resonant cavity

Unstable resonator

372102, 372 20, H01S 3086

Patent

active

043618898

ABSTRACT:
An unstable resonator to be used in high power, narrow line CO.sub.2 pump lasers comprises an array of four reflectors in a ring configuration wherein spherical and planar wavefronts are separated from each other along separate optical paths and only the planar wavefronts are impinged on a plane grating for line tuning. The reflector array comprises a concave mirror for reflecting incident spherical waves as plane waves along an output axis to form an output beam. A plane grating on the output axis is oriented to reflect a portion of the output beam off axis onto a planar relay mirror spaced apart from the output axis in proximity to the concave mirror. The relay mirror reflects plane waves from the grating to impinge on a convex expanding mirror spaced apart from the output axis in proximity to the grating. The expanding mirror reflects the incident planar waves as spherical waves to illuminate the concave mirror. Tuning is provided by rotating the plane grating about an axis normal to the output axis.

REFERENCES:
patent: 3691477 (1972-09-01), Janney
patent: 3928817 (1975-12-01), Chodzko
Deka et al., High-Power Tuned TEA CO.sub.2 Laser Using a Three-Mirror Confocal Unstable Resonator, Appl. Optics, vol. 18, No. 22, (Nov. 15, 1979), pp. 3722-3724.
Siegman, Unstable Optical Resonators, Appl. Optics, vol. 13, No. 2, (Feb. 1974), pp. 353-367.

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