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Proceedings Paper

Design and analysis of flexure mounts for precision optics
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Paper Abstract

The increasing demand within the astronomy community for direct detection of extrasolar Jovian planets is driving the development of the next generation of ground-based, precision instruments like the Gemini Planet Imager (GPI). The precision and stability of the opto-mechanical components within GPI needed to achieve the required 10-7 contrast will challenge the limits of design and material properties. This study examines the challenge of mounting small, high-precision mirrors (~1nm RMS WFE) for all gravity orientations, for 30°C temperature fluctuations and for vibration conditions typical of a cassegrain-mounted instrument on the Gemini telescopes. Various flexure-based mounting schemes, typically used for small optics (12 mm to 50 mm diameter), are considered in the context of the GPI opto-mechanical requirements. Through this study several candidate designs are selected for detailed investigation. The further design, analysis, and optimization of these candidate flexure designs are presented and evaluated against the relevant requirements. Special consideration and discussion is devoted to finite element analysis techniques and optimization procedures. Finally, the chosen flexure configuration is prescribed for the range of mirror sizes within GPI.

Paper Details

Date Published: 23 July 2008
PDF: 8 pages
Proc. SPIE 7018, Advanced Optical and Mechanical Technologies in Telescopes and Instrumentation, 70181K (23 July 2008); doi: 10.1117/12.790046
Show Author Affiliations
Joeleff Fitzsimmons, National Research Council Canada, Herzberg Institute of Astrophysics (Canada)
Darren Erickson, National Research Council Canada, Herzberg Institute of Astrophysics (Canada)
Alexis Hill, National Research Council Canada, Herzberg Institute of Astrophysics (Canada)
Randall Bartos, Jet Propulsion Lab. (United States)
James K. Wallace, Jet Propulsion Lab. (United States)


Published in SPIE Proceedings Vol. 7018:
Advanced Optical and Mechanical Technologies in Telescopes and Instrumentation
Eli Atad-Ettedgui; Dietrich Lemke, Editor(s)

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