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Optical Engineering

Compliant deformable mirror approach for wavefront improvement
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Paper Abstract

We describe a compliant static deformable mirror approach to reduce the wavefront concavity at the Navy Precision Optical Interferometer (NPOI). A single actuator pressing on the back surface of just one of the relay mirrors deforms the front surface in a correcting convex shape. Our design uses the mechanical advantage gained from a force actuator sandwiched between a rear flexure plate and the back surface of the mirror. We superimpose wavefront contour measurements with our finite element deformed mirror model. An example analysis showed improvement from 210-nm concave–concave wavefront to 51-nm concave–concave wavefront. With our present model, a 100-nm actuator increment displaces the mirror surface by 1.1 nm. We describe the need for wavefront improvement that arises from the NPOI reconfigurable array, offer a practical design approach, and analyze the support structure and compliant deformable mirror using the finite element method. We conclude that a 20.3-cm-diameter, 1.9-cm-thick Zerodur® mirror shows that it is possible to deform the reflective surface and cancel out three-fourths of the wavefront deformation without overstressing the material.

Paper Details

Date Published: 28 April 2016
PDF: 10 pages
Opt. Eng. 55(4) 043107 doi: 10.1117/1.OE.55.4.043107
Published in: Optical Engineering Volume 55, Issue 4
Show Author Affiliations
James H. Clark, U.S. Naval Research Lab. (United States)
F. Ernesto Penado, Northern Arizona Univ. (United States)

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