Coherent light generators – Particular pumping means – Pumping with optical or radiant energy
Reexamination Certificate
2006-05-23
2006-05-23
Harvey, Minsun Oh (Department: 2828)
Coherent light generators
Particular pumping means
Pumping with optical or radiant energy
C372S099000
Reexamination Certificate
active
07050474
ABSTRACT:
The present invention describes a technique for achieving high peak power output in a laser employing single-stage, multi-pass amplification. High gain is achieved by employing a very small “seed” beam diameter in gain medium, and maintaining the small beam diameter for multiple high-gain pre-amplification passes through a pumped gain medium, then leading the beam out of the amplifier cavity, changing the beam diameter and sending it back to the amplifier cavity for additional, high-power amplification passes through the gain medium. In these power amplification passes, the beam diameter in gain medium is increased and carefully matched to the pump laser's beam diameter for high efficiency extraction of energy from the pumped gain medium. A method of “grooming” the beam by means of a far-field spatial filter in the process of changing the beam size within the single-stage amplifier is also described.
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Chang Zenghu
Shan Bing
Wang Chun
Cohn Howard M.
Harvey Minsun Oh
Kansas State University Research Foundation
Roy Tod T. Van
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