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Proceedings Paper

Interferometric adaptive optics for high-power laser pointing, wavefront control, and phasing
Author(s): K. L. Baker; E. A. Stappaerts; D. C. Homoelle; M. A. Henesian; E. S. Bliss; C. W. Siders; C. P. J. Barty
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Paper Abstract

Implementing the capability to perform fast ignition experiments, as well as, radiography experiments on the National Ignition Facility (NIF) places stringent requirements on the control of each of the beam's pointing and overall wavefront quality. One quad of the NIF beams, 4 beam pairs, will be utilized for these experiments and hydrodynamic and particle-in-cell simulations indicate that for the fast ignition experiments, these beams will be required to deliver 50%(4.0 kJ) of their total energy(7.96 kJ) within a 40 μm diameter spot at the end of a fast ignition cone target. This requirement implies a stringent pointing and overall phase conjugation error budget on the adaptive optics system used to correct these beam lines. The overall encircled energy requirement is more readily met by phasing of the beams in pairs but still requires high Strehl ratios, Sr, and RMS tip/tilt errors of approximately one μrad. To accomplish this task we have designed an interferometric adaptive optics system capable of beam pointing, high Strehl ratio and beam phasing with a single pixilated MEMS deformable mirror and interferometric wave-front sensor. We present the design of a testbed used to evaluate the performance of this wave-front sensor below along with simulations of its expected performance level.

Paper Details

Date Published: 24 February 2009
PDF: 17 pages
Proc. SPIE 7209, MEMS Adaptive Optics III, 720907 (24 February 2009); doi: 10.1117/12.816574
Show Author Affiliations
K. L. Baker, Lawrence Livermore National Lab. (United States)
E. A. Stappaerts, Lawrence Livermore National Lab. (United States)
Stappaerts Consulting, LLC (United States)
D. C. Homoelle, Lawrence Livermore National Lab. (United States)
M. A. Henesian, Lawrence Livermore National Lab. (United States)
E. S. Bliss, Lawrence Livermore National Lab. (United States)
C. W. Siders, Lawrence Livermore National Lab. (United States)
C. P. J. Barty, Lawrence Livermore National Lab. (United States)

Published in SPIE Proceedings Vol. 7209:
MEMS Adaptive Optics III
Scot S. Olivier; Thomas G. Bifano; Joel A. Kubby, Editor(s)

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