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《Acta Optica Sinica》 1983-03
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High efficiency and wide-range anti-reflection coatings in the infrared region

LI ZHONGQI (Kunming Institute of Physics)  
The calculated formula of equivalent refractive index N* of non-symmetrical three-layer period (a b c) has been derived in this papsr. The formula has been used for the design of anti-reflection coatings in infrared. The calculated and experimental results are given in the paper. The average transmisson of the coatings is 98 in the response wave region of InSb (3~5μm) detector and HgCdTe (8~12μm) detector. The average transmission of the coatings is greater than or equal to 94% in 2~13μm, 3 ~ 14μm and 3.5~ 15μm. Especially in 11μm wavelength region (3.8~14.8μm), the minimum transmission of the coatings is greater than or equal to 90%.
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