New design techniques and alignment methods for CGH-null testing of aspheric surface

Guo guo Kang; Jing-hui Xie; Yi Liu

doi:10.1117/12.791080

12 March 2008 New design techniques and alignment methods for CGH-null testing of aspheric surface

Guo guo Kang, Jing-hui Xie, Yi Liu

Proceedings Volume 6624, International Symposium on Photoelectronic Detection and Imaging 2007: Optoelectronic System Design, Manufacturing, and Testing; 66240K (2008) https://doi.org/10.1117/12.791080
Event: International Symposium on Photoelectronic Detection and Imaging: Technology and Applications 2007, 2007, Beijing, China

Abstract

The entire process of designing the test setup with a computer-generated hologram (CGH), fabricating the CGH with a laser direct writing system and performing the CGH-null test of an asphere will be described in detail. New considerations in designing the null corrector with calculating CGH's phase function, filtering off unwanted diffraction orders and aligning CGH to the interferometer are discussed. A laser writing machine is used to fabricate designing patterns onto plane substrate and substrate figure error, pattern distortion, etching and duty cycle variations that influence the reconstructed wavefront are quantitatively analyzed in theory and corresponding error equations are obtained. The CGH used for measuring a paraboloid mirror is designed and fabricated. Experimental results of interferometric CGH-null test are presented.

Citation Download Citation

Guo guo Kang, Jing-hui Xie, and Yi Liu "New design techniques and alignment methods for CGH-null testing of aspheric surface", Proc. SPIE 6624, International Symposium on Photoelectronic Detection and Imaging 2007: Optoelectronic System Design, Manufacturing, and Testing, 66240K (12 March 2008); https://doi.org/10.1117/12.791080

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