High brightness cold burst solid state laser operation

Coherent light generators – Particular pumping means

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372 81, 372 35, 372 25, H01S 309

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054065771

ABSTRACT:
A solid state laser having an elliptical chamber 22, a solid state laser rod 10, a flashtube 12 for optically pumping the rod 10, external mirrors 24,26 providing an optical cavity, the flashlamp 12 being energized by a pulse generator 14 which generates electrical pulses across the flashlamp 12, is provided with cold burst pumping of the flashlamp 12 by a burst 120 of a predetermined number of pulses, e.g., 40 pulses, each having a predetermined pulse width, e.g., 650 msec, and the burst lasting a predetermined length of time, e.g., 200 msec, not to exceed 1/16 to 1/12 of the thermal time constant of the solid state laser rod 10. Cold burst pumping provides a substantially constant thermal rod profile which reduces divergence of the output beam 36 and increases beam brightness, thereby improving the productivity and precision of solid state lasers.

REFERENCES:
patent: 3668548 (1972-06-01), Osial et al.
patent: 4950268 (1990-08-01), Rink
patent: 5222073 (1993-06-01), Epstein et al.
patent: 5226051 (1993-07-01), Chan et al.
W. Koechner, "Solid-State Laser Engineering," Springer Series in Optical Sciences, 1976, pp. 368-375.
FP 91-125, Pratt & Whitney, "Advanced Drilling Methods for Shaped Holes," vol. I-Technical Proposal, dated 18 Jul. 1991.

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