Articles

Interferometric adaptive optics for high-power laser pointing and wavefront control and phasing

[+] Author Affiliations
Kevin L. Baker

Lawrence Livermore National Laboratory, 7000 East Avenue, Livermore, California 94550-0345

Eddy A. Stappaerts

Lawrence Livermore National Laboratory, 7000 East Avenue, Livermore, California 94550-0345 and Stappaerts Consulting, LLC, San Ramon, California

Doug C. Homoelle, Mark A. Henesian, Erlan S. Bliss, Craig W. Siders, Chris P. J. Barty

Lawrence Livermore National Laboratory, 7000 East Avenue, Livermore, California 94550-0345

J. Micro/Nanolith. MEMS MOEMS. 8(3), 033040 (July 09, 2009). doi:10.1117/1.3167840
History: Received March 11, 2009; Revised May 15, 2009; Accepted May 26, 2009; Published July 09, 2009
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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, four 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% (4.0kJ) of their total energy (7.96kJ) within a 40-μm-diam 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 and root-mean-square tip/tilt errors of approximately 1μrad. 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 microelectromechanical systems deformable mirror and interferometric wavefront sensor. We present the design of a testbed used to evaluate the performance of this wavefront sensor along with simulations of its expected performance level.

© 2009 Society of Photo-Optical Instrumentation Engineers

Citation

Kevin L. Baker ; Eddy A. Stappaerts ; Doug C. Homoelle ; Mark A. Henesian ; Erlan S. Bliss, et al.
"Interferometric adaptive optics for high-power laser pointing and wavefront control and phasing", J. Micro/Nanolith. MEMS MOEMS. 8(3), 033040 (July 09, 2009). ; http://dx.doi.org/10.1117/1.3167840


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