Optical test for the primary mirror of a space telescope using a CGH null lens

Jae Bong Song; Yun Woo Lee; Hoi Youn Lee; Ho Soon Yang; In Won Lee

doi:10.1117/12.668159

1 February 2006 Optical test for the primary mirror of a space telescope using a CGH null lens

Jae Bong Song, Yun Woo Lee, Hoi Youn Lee, Ho Soon Yang, In Won Lee

Proceedings Volume 6034, ICO20: Optical Design and Fabrication; 60341M (2006) https://doi.org/10.1117/12.668159
Event: ICO20:Optical Devices and Instruments, 2005, Changchun, China

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.

Citation Download Citation

Jae Bong Song, Yun Woo Lee, Hoi Youn Lee, Ho Soon Yang, and In Won Lee "Optical test for the primary mirror of a space telescope using a CGH null lens", Proc. SPIE 6034, ICO20: Optical Design and Fabrication, 60341M (1 February 2006); https://doi.org/10.1117/12.668159

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