A support structure for a compliant deformable mirror

F E Penado, James H. Clark, Joel Dugdale

Research output: Chapter in Book/Report/Conference proceedingConference contribution

3 Citations (Scopus)

Abstract

The Navy's ground-based optical interferometer requires 10 discrete reflections for each of its six stations that transport stellar radiation into a six-way beam combiner where the modulated beams are overlapped in a collinear fashion and fringes obtained for analysis. Wavefront aberrations, introduced at each reflection from non-perfect mirrors, reduce the quality of fringe contrast and adversely affect the final science results. In practice, mirror fabrication and mounting methods generate small surface irregularities that produce aberrations in the reflected wavefront beam. Under multiple reflection scenarios, these errors do not necessarily cancel one another, and can increase the resultant wavefront distortion. In a previous paper, we showed a single-force actuator acting on the back surface of an 8-inch diameter Zerodur® mirror will achieve a canceling deformation in the reflective surface that substantially reduces the combined wavefront aberrations resulting from a 7-reflection beam. Our finite element model demonstrated that the peak-to-valley difference can be reduced from 210 nm to 55 nm. In this paper, we extend our previous work to include a support structure to contain the deforming mirror and analyze its interaction and effect on the corrected wavefront. Our design used the mechanical advantage gained from a tuned flexure plate with a simple motorized screw actuator applied to the back mirror surface to achieve an 87:1 deflection ratio on the front mirror surface. A practical design is proposed, the support structure and mirror analyzed using the finite element method, and the results presented and discussed.

Original languageEnglish (US)
Title of host publicationProceedings of SPIE - The International Society for Optical Engineering
Volume8491
DOIs
StatePublished - 2012
EventOptical System Alignment, Tolerancing, and Verification VI - San Diego, CA, United States
Duration: Aug 12 2012Aug 13 2012

Other

OtherOptical System Alignment, Tolerancing, and Verification VI
CountryUnited States
CitySan Diego, CA
Period8/12/128/13/12

Fingerprint

Deformable Mirror
deformable mirrors
Wavefronts
Mirror
Mirrors
mirrors
Wave Front
Aberrations
Aberration
aberration
Actuators
Actuator
actuators
stellar radiation
navy
Flexure
Mountings
flexing
Cancel
Collinear

Keywords

  • Adaptive optics
  • Finite element analysis
  • Mirror deformations
  • NPOI
  • Optical interferometry
  • Single force actuator
  • Static deformable mirror
  • Wavefront distortion

ASJC Scopus subject areas

  • Applied Mathematics
  • Computer Science Applications
  • Electrical and Electronic Engineering
  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

Cite this

Penado, F. E., Clark, J. H., & Dugdale, J. (2012). A support structure for a compliant deformable mirror. In Proceedings of SPIE - The International Society for Optical Engineering (Vol. 8491). [84910D] https://doi.org/10.1117/12.930008

A support structure for a compliant deformable mirror. / Penado, F E; Clark, James H.; Dugdale, Joel.

Proceedings of SPIE - The International Society for Optical Engineering. Vol. 8491 2012. 84910D.

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Penado, FE, Clark, JH & Dugdale, J 2012, A support structure for a compliant deformable mirror. in Proceedings of SPIE - The International Society for Optical Engineering. vol. 8491, 84910D, Optical System Alignment, Tolerancing, and Verification VI, San Diego, CA, United States, 8/12/12. https://doi.org/10.1117/12.930008
Penado FE, Clark JH, Dugdale J. A support structure for a compliant deformable mirror. In Proceedings of SPIE - The International Society for Optical Engineering. Vol. 8491. 2012. 84910D https://doi.org/10.1117/12.930008
Penado, F E ; Clark, James H. ; Dugdale, Joel. / A support structure for a compliant deformable mirror. Proceedings of SPIE - The International Society for Optical Engineering. Vol. 8491 2012.
@inproceedings{d92709bf036a437bbc61aa3a1cafa0bc,
title = "A support structure for a compliant deformable mirror",
abstract = "The Navy's ground-based optical interferometer requires 10 discrete reflections for each of its six stations that transport stellar radiation into a six-way beam combiner where the modulated beams are overlapped in a collinear fashion and fringes obtained for analysis. Wavefront aberrations, introduced at each reflection from non-perfect mirrors, reduce the quality of fringe contrast and adversely affect the final science results. In practice, mirror fabrication and mounting methods generate small surface irregularities that produce aberrations in the reflected wavefront beam. Under multiple reflection scenarios, these errors do not necessarily cancel one another, and can increase the resultant wavefront distortion. In a previous paper, we showed a single-force actuator acting on the back surface of an 8-inch diameter Zerodur{\circledR} mirror will achieve a canceling deformation in the reflective surface that substantially reduces the combined wavefront aberrations resulting from a 7-reflection beam. Our finite element model demonstrated that the peak-to-valley difference can be reduced from 210 nm to 55 nm. In this paper, we extend our previous work to include a support structure to contain the deforming mirror and analyze its interaction and effect on the corrected wavefront. Our design used the mechanical advantage gained from a tuned flexure plate with a simple motorized screw actuator applied to the back mirror surface to achieve an 87:1 deflection ratio on the front mirror surface. A practical design is proposed, the support structure and mirror analyzed using the finite element method, and the results presented and discussed.",
keywords = "Adaptive optics, Finite element analysis, Mirror deformations, NPOI, Optical interferometry, Single force actuator, Static deformable mirror, Wavefront distortion",
author = "Penado, {F E} and Clark, {James H.} and Joel Dugdale",
year = "2012",
doi = "10.1117/12.930008",
language = "English (US)",
isbn = "9780819492081",
volume = "8491",
booktitle = "Proceedings of SPIE - The International Society for Optical Engineering",

}

TY - GEN

T1 - A support structure for a compliant deformable mirror

AU - Penado, F E

AU - Clark, James H.

AU - Dugdale, Joel

PY - 2012

Y1 - 2012

N2 - The Navy's ground-based optical interferometer requires 10 discrete reflections for each of its six stations that transport stellar radiation into a six-way beam combiner where the modulated beams are overlapped in a collinear fashion and fringes obtained for analysis. Wavefront aberrations, introduced at each reflection from non-perfect mirrors, reduce the quality of fringe contrast and adversely affect the final science results. In practice, mirror fabrication and mounting methods generate small surface irregularities that produce aberrations in the reflected wavefront beam. Under multiple reflection scenarios, these errors do not necessarily cancel one another, and can increase the resultant wavefront distortion. In a previous paper, we showed a single-force actuator acting on the back surface of an 8-inch diameter Zerodur® mirror will achieve a canceling deformation in the reflective surface that substantially reduces the combined wavefront aberrations resulting from a 7-reflection beam. Our finite element model demonstrated that the peak-to-valley difference can be reduced from 210 nm to 55 nm. In this paper, we extend our previous work to include a support structure to contain the deforming mirror and analyze its interaction and effect on the corrected wavefront. Our design used the mechanical advantage gained from a tuned flexure plate with a simple motorized screw actuator applied to the back mirror surface to achieve an 87:1 deflection ratio on the front mirror surface. A practical design is proposed, the support structure and mirror analyzed using the finite element method, and the results presented and discussed.

AB - The Navy's ground-based optical interferometer requires 10 discrete reflections for each of its six stations that transport stellar radiation into a six-way beam combiner where the modulated beams are overlapped in a collinear fashion and fringes obtained for analysis. Wavefront aberrations, introduced at each reflection from non-perfect mirrors, reduce the quality of fringe contrast and adversely affect the final science results. In practice, mirror fabrication and mounting methods generate small surface irregularities that produce aberrations in the reflected wavefront beam. Under multiple reflection scenarios, these errors do not necessarily cancel one another, and can increase the resultant wavefront distortion. In a previous paper, we showed a single-force actuator acting on the back surface of an 8-inch diameter Zerodur® mirror will achieve a canceling deformation in the reflective surface that substantially reduces the combined wavefront aberrations resulting from a 7-reflection beam. Our finite element model demonstrated that the peak-to-valley difference can be reduced from 210 nm to 55 nm. In this paper, we extend our previous work to include a support structure to contain the deforming mirror and analyze its interaction and effect on the corrected wavefront. Our design used the mechanical advantage gained from a tuned flexure plate with a simple motorized screw actuator applied to the back mirror surface to achieve an 87:1 deflection ratio on the front mirror surface. A practical design is proposed, the support structure and mirror analyzed using the finite element method, and the results presented and discussed.

KW - Adaptive optics

KW - Finite element analysis

KW - Mirror deformations

KW - NPOI

KW - Optical interferometry

KW - Single force actuator

KW - Static deformable mirror

KW - Wavefront distortion

UR - http://www.scopus.com/inward/record.url?scp=84872556862&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84872556862&partnerID=8YFLogxK

U2 - 10.1117/12.930008

DO - 10.1117/12.930008

M3 - Conference contribution

AN - SCOPUS:84872556862

SN - 9780819492081

VL - 8491

BT - Proceedings of SPIE - The International Society for Optical Engineering

ER -