Coherent light generators – Particular beam control device – Control of pulse characteristics
Patent
1998-04-09
2000-01-18
Scott, Jr., Leon
Coherent light generators
Particular beam control device
Control of pulse characteristics
372 10, 372 18, 372 31, 372 75, 372103, 372106, H01S 310
Patent
active
060163240
ABSTRACT:
A laser system which generates short duration pulses, such as under five nanoseconds at an energy level of up to a few milli-Joules per pulse (mJ/p) with near diffraction limited beam quality. A laser crystal is pumped (excited) by diode lasers. A resonator having at least two mirror surfaces defines a beam path passing through the laser crystal. The beam path in the resonator is periodically blocked by a first optical shutter permitting pump energy to build up in the laser crystal, except for a short period near the end of each pumping period. While the first optical shutter is open a second optical shutter blocks the light in the resonator except for periodic short intervals, the intervals being spaced such that at least one light pulse traveling at the speed of light in the resonator is able to make a plurality of transits through the resonator, increasing in intensity by extracting energy from the excited laser crystal on each transit. After the light pulse has built up in intensity, an optical release mechanism releases the pulse from resonator.
REFERENCES:
patent: 4630275 (1986-12-01), Rapoport
patent: 4930901 (1990-06-01), Johnson et al.
patent: 5140600 (1992-08-01), Rebhan
patent: 5339323 (1994-08-01), Hunter et al.
patent: 5742834 (1998-04-01), Rieger et al.
Foster Richard
Rieger Harry
Shields Henry
JMAR Research, Inc.
Jr. Leon Scott
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