28 April 2016 Compliant deformable mirror approach for wavefront improvement
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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 (SPIE)
James H. Clark, James H. Clark, F. Ernesto Penado, F. Ernesto Penado, } "Compliant deformable mirror approach for wavefront improvement," Optical Engineering 55(4), 043107 (28 April 2016). https://doi.org/10.1117/1.OE.55.4.043107 . Submission:
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