Diffraction filtered large mode laser resonator

Details Diffraction filtered large mode laser resonator Diffraction filtered large mode laser resonator

1990-04-12

1991-11-12

Sikes, William L.

Coherent light generators

Particular resonant cavity

Specified cavity component

372108, 372 95, H01S 308

Patent

active

050654071

ABSTRACT:
A laser resonator that is geometrically stable by classical definition is provided with beneficial characteristics of an unstable type through the use of a novel implementation of spatial filtering. A pinhole aperture is provided as part of, or on conjunction with, a mirror at one end of the cavity to cause light reflected from the mirror to diverge as it is directed toward the other end of the cavity. A spot focus of light, as usually found in spatial filters, is not utilized. The result is a laser cavity structure which provides a large mode beam within the cavity, a good quality output beam having a smoothly varying intensity distribution across it and which is easy to align.

REFERENCES:
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patent: 4868515 (1989-09-01), Reintjes et al.
patent: 4942588 (1990-07-01), Yasui et al.
patent: 5012483 (1991-04-01), Reintjes et al.
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Bianchi et al., "Characterization of a Modified SFUR Nd:YAG Oscillator in Various Pulsed Regimes", SPIE, vol. 701, ECOOSA (Florence 1986), pp. 132-135.
DiLazzaro et al., "A Generalization of the Self-Filtering Unstable Resonator", IEEE Journal of Quantum Electronics, vol. 24, No. 8, Aug. 1988, pp. 1543-1547.
Pax et al., "High Energy Cavity Dumped Active/Passive Mode-Locked Pulsed Nd:YAG Laser", Poster Paper, 1989 Technical Digest Series, vol. 11, Conference on Lasers and Electro-Optics (CLEO), Apr. 24, 1989, pp. 198-199.
Min et al., "Confocal Postive Branch.gtoreq.Filtering Unstable Resonator for Nd:YAG Laser", Optics Communications, vol. 74, No. 1.2, Dec. 1, 1989, pp. 79-83.

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