Analytical design of multicycle broadband AR coatings

Uwe B. Schallenberg; Stefan Jakobs; Norbert Kaiser

doi:10.1117/12.360085

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7 September 1999 Analytical design of multicycle broadband AR coatings

Uwe B. Schallenberg, Stefan Jakobs, Norbert Kaiser

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Proceedings Volume 3738, Advances in Optical Interference Coatings; (1999) https://doi.org/10.1117/12.360085
Event: Optical Systems Design and Production, 1999, Berlin, Germany

Abstract

Normal-incidence multicycle broadband AR coatings on glass with low residual over the wavelength region 400 nm to 800 nm are theoretically discussed. Using the method of effective interfaces and the concept of equivalent index layers a 4-layer design sub(AHBL)air is expanded into the designs sub[AH(C2LC)²BL]air where A, B, C, H, and L are quarter-wave layers with refractive indices n_H equals 1.38, n_L equals 2.35, and n_L < n_(Lambda ), b_B, n_C, < n_H. These designs represent 1-cycle, 2- cycle, and 3-cycle broadband AR coatings and perform a residual reflectance of 0.20 percent, 0.14 percent, and 0.10 percent, respectively. Four other designs demonstrate the approach at other wavelength regions. In one example, all quarter-wave layers with refractive indices in-between n_L and n_H are analytically substituted using equivalent index layers to get two-material multilayers suitable for practical applications. After this, the design is refined with respect to the optical thickness whereby the layer number is fixed. The resulting design consists of 18 layers and performs an average residual reflectance 0.085 percent over the region 400 nm to 800 nm.

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Uwe B. Schallenberg, Stefan Jakobs, and Norbert Kaiser "Analytical design of multicycle broadband AR coatings", Proc. SPIE 3738, Advances in Optical Interference Coatings, (7 September 1999); https://doi.org/10.1117/12.360085

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