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Proceedings Paper

Zonal deformable mirror for laser wavefront control
Author(s): Charles D. Swift; John W. Bergum; Erlan S. Bliss; F. Allen House; Marcus A. Libkind; J. Thaddeus Salmon; Carolyn L. Weinzapfel
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Paper Abstract

We have developed a zonal deformable mirror that controls the wavefront of a high average power visible laser beam used for isotope separation. The mirror corrects greater than five waves of astigmatism, power, or random second order aberrations to 1/20 wave rms. Sufficient resolution is achieved to correct third order aberrations as well. A monolithic glass substrate with dimensions 77 mm X 121 mm X 10 mm is used in this design. Twenty-five actuator attachment members are incorporated into the shape of the back side of the substrate. Piezoelectric translators (PZTs) attached in a rectangular array deform the continuous substrate to the proper conjugate shape. The PZTs are attached through flexures designed to be compressionally stiff and laterally soft. In this way the intended PZT displacement is transmitted efficiently to the substrate while isolating both the mirror and the PZTs from undesirable lateral loads. Mirror parameters were determined from elastic mechanical beam approximations. Finite element analysis was used to verify performance prior to prototyping. A Hartmann sensor controls the mirror in a closed loop adaptive system. The system description is covered in a companion paper. This paper describes the mirror design and presents performance data.

Paper Details

Date Published: 13 January 1992
PDF: 13 pages
Proc. SPIE 1543, Active and Adaptive Optical Components, (13 January 1992); doi: 10.1117/12.51173
Show Author Affiliations
Charles D. Swift, Lawrence Livermore National Lab. (United States)
John W. Bergum, Lawrence Livermore National Lab. (United States)
Erlan S. Bliss, Lawrence Livermore National Lab. (United States)
F. Allen House, Lawrence Livermore National Lab. (United States)
Marcus A. Libkind, Lawrence Livermore National Lab. (United States)
J. Thaddeus Salmon, Lawrence Livermore National Lab. (United States)
Carolyn L. Weinzapfel, Lawrence Livermore National Lab. (United States)

Published in SPIE Proceedings Vol. 1543:
Active and Adaptive Optical Components
Mark A. Ealey, Editor(s)

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