CGH null design and fabrication for CFH telescope simulator

Details CGH null design and fabrication for CFH telescope simulator CGH null design and fabrication for CFH telescope simulator

Feb 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004spie.5252..293w&link_type=abstract

Optical Fabrication, Testing, and Metrology. Edited by Geyl, Roland; Rimmer, David; Wang, Lingli. Proceedings of the SPIE, Volu

Computer Science

Performance

Scientific paper

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.

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