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Proceedings Paper

Study on the structure of CGH with same diffraction efficiency of 0-order and 1-order
Author(s): Jian-feng Ren; Peiji Guo; Biao Zhang
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Paper Abstract

In order to get an interference fringe with sharp contrast, the energy of reference beam and testing beam approximate same in testing the off-axis convex aspheric surface using double CGHs. The fringe contrast could reach 1 with same energy of these two lights. According to diffractive theory, a novel structure of grating has been proposed to make 0-order diffraction efficiency equal to +1-order diffraction efficiency by varying height of grating groove, duty cycle and diffractive order. The efficiencies of 0-order and 1-order are both 28.8% when the duty cycle is 0. 5 and the height of grating groove are 0.639π. In addition, this micro-structure can use the energy of the induce-light effectively. This macro-structure pattern of CGHs may satisfy the requirement of sharp contrast, which makes it possible to test off-axis convex aspheric surface with double CGHs.

Paper Details

Date Published: 12 October 2010
PDF: 5 pages
Proc. SPIE 7656, 5th International Symposium on Advanced Optical Manufacturing and Testing Technologies: Optical Test and Measurement Technology and Equipment, 76567G (12 October 2010); doi: 10.1117/12.865565
Show Author Affiliations
Jian-feng Ren, Suzhou Univ. (China)
Peiji Guo, Suzhou Univ. (China)
Biao Zhang, Changchun Univ. of Science and Technology (China)


Published in SPIE Proceedings Vol. 7656:
5th International Symposium on Advanced Optical Manufacturing and Testing Technologies: Optical Test and Measurement Technology and Equipment
Yudong Zhang; Jose M. Sasian; Libin Xiang; Sandy To, Editor(s)

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