Imaging Components, Systems, and Processing

Compliant deformable mirror approach for wavefront improvement

[+] Author Affiliations
James H. Clark, III

Naval Research Laboratory/NPOI, 10391 West Observatory Road, Flagstaff, Arizona 86001, United States

F. Ernesto Penado

Northern Arizona University, Department of Mechanical Engineering, NAU Engineering Building 69, 15600 South McConnell Drive, Flagstaff, Arizona 86011-5600, United States

Opt. Eng. 55(4), 043107 (Apr 28, 2016). doi:10.1117/1.OE.55.4.043107
History: Received May 14, 2015; Accepted March 23, 2016
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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.

© 2016 Society of Photo-Optical Instrumentation Engineers

Citation

James H. Clark, III and F. Ernesto Penado
"Compliant deformable mirror approach for wavefront improvement", Opt. Eng. 55(4), 043107 (Apr 28, 2016). ; http://dx.doi.org/10.1117/1.OE.55.4.043107


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