Laser writing system for test of large aspheric surfaces

Hyug-Gyo Rhee; Jae-Bong Song; Dong-Ik Kim; Kwan-Soo Ha; Seung-Ki Hong; Yun-Woo Lee; In-Won Lee; Jae-Heung Jo

doi:10.1117/12.783504

17 January 2008 Laser writing system for test of large aspheric surfaces

Hyug-Gyo Rhee, Jae-Bong Song, Dong-Ik Kim, Kwan-Soo Ha, Seung-Ki Hong, Yun-Woo Lee, In-Won Lee, Jae-Heung Jo

Proceedings Volume 6723, 3rd International Symposium on Advanced Optical Manufacturing and Testing Technologies: Optical Test and Measurement Technology and Equipment; 67233F (2008) https://doi.org/10.1117/12.783504
Event: 3rd International Symposium on Advanced Optical Manufacturing and Testing Technologies: Large Mirrors and Telescopes, 2007, Chengdu, China

Abstract

KRISS Space Optics Research Center has tested large aspheric surfaces by using interferometry and a series of computer-generated hologram (CGH). In this case it is necessary to fabricate various CGHs in the laboratory level. To address this purpose we are developing and improving a simple and precise laser writing system which uses a cylindrical or circular coordinate. In our system 300 mm diameter CGH can be fabricated with 0.8 μm spatial resolution in radial direction. The writing source Ar+ laser is stabilized by intensity feedback, and gives us approximately 800 mW after the stabilization process at 457.9 nm wavelength. The stabilized beam power is controlled again to make 256 different intensity levels. We also used an auto-focusing technique with astigmatic lenses for the purpose of focusing the writing beam on the material surface.

Citation Download Citation

Hyug-Gyo Rhee, Jae-Bong Song, Dong-Ik Kim, Kwan-Soo Ha, Seung-Ki Hong, Yun-Woo Lee, In-Won Lee, and Jae-Heung Jo "Laser writing system for test of large aspheric surfaces", Proc. SPIE 6723, 3rd International Symposium on Advanced Optical Manufacturing and Testing Technologies: Optical Test and Measurement Technology and Equipment, 67233F (17 January 2008); https://doi.org/10.1117/12.783504

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