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Optical Engineering

Bilayer pellicle and bilayer-coated prism beamsplitters for the division-of-amplitude photopolarimeter
Author(s): Rasheed M. A. Azzam; A. De; F. F. Sudradjat
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Paper Abstract

A procedure is presented for the design of bilayer pellicle and bilayer-coated prism beam splitters that serve as the key optical element of the division-of-amplitude photopolarimeter (DOAP). The bilayer consists of two transparent thin films of sufficiently different refractive indices whose thicknesses are selected to achieve 50 to 50% split ratio and optimum ellipsometric parameters in reflection and transmission, such that the determinant of the DOAP instrument matrix is maximized at the proper angle of incidence. As a specific example, we present a Ge-coated nitrocellulose (NC) first-order pellicle beamsplitter for the near IR (2.0 to 2.2 µm). Visible designs include a GaP-coated NC fourth-order pellicle and a SiO2-GaP bilayer-coated glass prism at and near the 633-nm wavelength. Operation of these beamsplitters over a range of incidence angles, wavelengths, and in the presence of ±5% film thickness errors is also considered.

Paper Details

Date Published: 1 July 2005
PDF: 9 pages
Opt. Eng. 44(7) 073802 doi: 10.1117/1.1951587
Published in: Optical Engineering Volume 44, Issue 7
Show Author Affiliations
Rasheed M. A. Azzam, Univ. of New Orleans (United States)
A. De, Univ. of New Orleans (United States)
F. F. Sudradjat, Univ. of New Orleans (United States)

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