Error control for high-power laser system employing...

Details Error control for high-power laser system employing... Error control for high-power laser system employing...

2007-04-10

2010-06-01

Harvey, Minsun (Department: 2828)

Coherent light generators

Particular beam control device

Optical output stabilization

C372S102000

Reexamination Certificate

active

07729398

ABSTRACT:
A high-power laser system includes a laser master oscillator, a plurality of fiber laser amplifiers producing intermediate output beamlets, a diffractive optical element for combining the intermediate beamlets into a combined output beam, and one or more error controllers for minimizing errors related to beam combination that may degrade the quality of the combined output beam. A piston error controller uses phase modulation to tag each non-reference intermediate beamlet with a unique dither signal harmonically unrelated to those used for the other beamlets. For each intermediate beamlet, the associated piston error is recovered using a synchronous detector, and an error control signal proportional to the piston error is supplied to a phase modulator to control the piston error for that beamlet. A tilt error controller uses amplitude modulation based on Hadamard code words to tag each non-reference intermediate beamlet with a unique code sequence orthogonal to those used for the other beamlets. For each intermediate beamlet, the associated tilt error is recovered using a Hadamard decoder, and an error control signal proportional to the tilt error is supplied to a beam steerer to control the tilt error for that beamlet.

REFERENCES:
patent: 3731103 (1973-05-01), O'Meara
patent: 3825845 (1974-07-01), Angelbeck et al.
patent: 4649351 (1987-03-01), Veldkamp et al.
patent: 4839884 (1989-06-01), Schloss
patent: 7468832 (2008-12-01), Rothenberg et al.
patent: 2005/0128554 (2005-06-01), Wickham et al.

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