Study on the structure of CGH with same diffraction efficiency of 0-order and 1-order

Jian-feng Ren; Peiji Guo; Biao Zhang

doi:10.1117/12.865565

11 October 2010 Study on the structure of CGH with same diffraction efficiency of 0-order and 1-order

Jian-feng Ren, Peiji Guo, Biao Zhang

Proceedings Volume 7656, 5th International Symposium on Advanced Optical Manufacturing and Testing Technologies: Optical Test and Measurement Technology and Equipment; 76567G (2010) https://doi.org/10.1117/12.865565
Event: 5th International Symposium on Advanced Optical Manufacturing and Testing Technologies, 2010, Dalian, China

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.

Citation Download Citation

Jian-feng Ren, Peiji Guo, and Biao Zhang "Study on the structure of CGH with same diffraction efficiency of 0-order and 1-order", Proc. SPIE 7656, 5th International Symposium on Advanced Optical Manufacturing and Testing Technologies: Optical Test and Measurement Technology and Equipment, 76567G (11 October 2010); https://doi.org/10.1117/12.865565

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KEYWORDS

Computer generated holography

Diffraction

Diffraction gratings

Mirrors

Off axis mirrors

Aspheric lenses

Wavefronts

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