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Proceedings Paper

Optical test for the primary mirror of a space telescope using a CGH null lens
Author(s): Jae Bong Song; Yun Woo Lee; Hoi Youn Lee; Ho Soon Yang; In Won Lee
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Paper Abstract

MSC (Multi-Spectral Camera) for KOMPSAT2 (Korea Multipurpose Satellite 2) is a Ritchey-Chretien type telescope. Its primary mirror (PM) is a hyperboloidal mirror with 600 mm diameter. To test the PM, we chose a CGH null lens as a null optics. The CGH null lens is much smaller than the Hindle shell, is consist of only one element, and is aligned more easily than the Offner type null lens. The CGH null lens is designed to align and test the aspheric surface at the same time. The CGH lens includes the main part to test the aspheric wavefront from the PM and also includes the alignment part to align the CGH and the PM. The alignment CGH part is consisted of three amplitude type reflection segments to align the CGH and the interferometer, and three phase type transmission segments to align the CGH and the PM. The CGH null lens is made of fused silica by a laser beam writer. We measured the Engineering Model of the PM using this CGH null lens.

Paper Details

Date Published: 1 February 2006
PDF: 6 pages
Proc. SPIE 6034, ICO20: Optical Design and Fabrication, 60341M (1 February 2006); doi: 10.1117/12.668159
Show Author Affiliations
Jae Bong Song, Korea Research Institute of Standards and Science (South Korea)
Yun Woo Lee, Korea Research Institute of Standards and Science (South Korea)
Hoi Youn Lee, Korea Research Institute of Standards and Science (South Korea)
Ho Soon Yang, Korea Research Institute of Standards and Science (South Korea)
In Won Lee, Korea Research Institute of Standards and Science (South Korea)


Published in SPIE Proceedings Vol. 6034:
ICO20: Optical Design and Fabrication
James Breckinridge; Yongtian Wang, Editor(s)

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