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


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