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Proceedings Paper

Intracavity adaptive correction of a 10-kW solid state heat-capacity laser
Author(s): Kai N. LaFortune; Randall L. Hurd; Erik M. Johansson; Clifford Brent Dane; Scott N. Fochs; James M. Brase
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Paper Abstract

The Solid-State, Heat-Capacity Laser (SSHCL), under development at Lawrence Livermore National Laboratory (LLNL) is a large aperture (100 cm2), confocal, unstable resonator requiring near-diffraction-limited beam quality. There are two primary sources of the aberrations in the system: residual, static aberrations from the fabrication of the optical components and predictable, time-dependent, thermally-induced index gradients within the gain medium. A deformable mirror placed within the cavity is used to correct the aberrations that are sensed with a Shack-Hartmann wavefront sensor. Although it is more challenging than external correction, intracavity correction enables control of the mode growth within the resonator, resulting in the ability to correct a more aberrated system longer. The overall system design, measurement techniques and correction algorithms are discussed. Experimental results from initial correction of the static aberrations and dynamic correction of the time-dependent aberrations are presented.

Paper Details

Date Published: 1 June 2004
PDF: 9 pages
Proc. SPIE 5333, Laser Resonators and Beam Control VII, (1 June 2004); doi: 10.1117/12.531034
Show Author Affiliations
Kai N. LaFortune, Lawrence Livermore National Lab. (United States)
Randall L. Hurd, Lawrence Livermore National Lab. (United States)
Erik M. Johansson, W.M. Keck Observatory (United States)
Clifford Brent Dane, Lawrence Livermore National Lab. (United States)
Scott N. Fochs, Lawrence Livermore National Lab. (United States)
James M. Brase, Lawrence Livermore National Lab. (United States)

Published in SPIE Proceedings Vol. 5333:
Laser Resonators and Beam Control VII
Alexis V. Kudryashov, Editor(s)

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