Design of wideband graded-index antireflection coatings at oblique light incidence |
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| Authors: | Zhang Jun-Chao Fang Ming Jin Yun-Xia and He Hong-Bo |
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| Affiliation: | Key Laboratory of Material Science and Technology for High Power Lasers, Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai 201800, China; Graduate University of Chinese Academy of Sciences, Beijing 100049, China |
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| Abstract: | We suggest a design method of graded-refractive-index (GRIN) antireflection (AR) coating for s-polarized or p-polarized light at off-normal incidence. The spectrum characteristic of the designed antireflection coating with a quintic effective refractive-index profile for a given state of polarization has been discussed. In addition, the genetic algorithm was used to optimize the refractive index profile of the GRIN antireflection for reducing the mean reflectance of s- and p-polarizations. The average reflectance loss was reduced to only 0.04% by applying optimized GRIN AR coatings onto BK7 glass over the wavelength range from 400 to 800 nm at the incident angle of θ0 =70°. |
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| Keywords: | antireflection coatings oblique incidence graded-refractive-index profile genetic algorithm |
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