CGH null design and fabrication for CFH telescope simulator

Min Wang; Simon Thibault

doi:10.1117/12.513382

26 February 2004 CGH null design and fabrication for CFH telescope simulator

Min Wang, Simon Thibault

Proceedings Volume 5252, Optical Fabrication, Testing, and Metrology; (2004) https://doi.org/10.1117/12.513382
Event: Optical Systems Design, 2003, St. Etienne, France

Abstract

A wavefront-generated simulator for Canada-France-Hawaii (CFH) 3.6-m telescope to test a novel wide-field IR camera (WIRCAM) of the telescope is presented. We investigate a Computer-Generated Hologram (CGH) wavefront generator to demonstrate off-axis aberrated wavefront generation with and with no rotational symmetry modes of Zernike polynomial as telescope wavefront simulator. A CGH simulator system to generate field optical performance of CFH telescope, while working on a F/3.8 prima focus with an field-of-view (FOV) of ±15 arcmin, is designed and computed for WIRCAM tests in optical labs for system performance evaluation. The CGH simulator is modeled as a diffractive surface defined by a phase function, and the optical phase function is specified by a Zernike polynomial phase equation. As the CGH simulator has to work in the first diffraction order, a carrier frequency must be added to the phase function in such a way to ensure the separation of the diffraction orders for eliminating unwanted light in the WIRCAM tests. Finally the nominal-design performance of the CGH simulator is compared with the tolerance analysis predictions as well as the system misalignment sensitivity.

Citation Download Citation

Min Wang and Simon Thibault "CGH null design and fabrication for CFH telescope simulator", Proc. SPIE 5252, Optical Fabrication, Testing, and Metrology, (26 February 2004); https://doi.org/10.1117/12.513382

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