Bilayer pellicle and bilayer-coated prism beamsplitters for the division-of-amplitude photopolarimeter

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 thickn...

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Published in:Optical Engineering 2005-07, Vol.44 (7), p.073802-073809
Main Authors: Azzam, Rasheed M. A, De, Amrit, Sudradjat, Faisal F
Format: Article
Language:English
Subjects:
beamsplitters
coatings
ellipsometry
gallium phosphide
infrared
pellicles
polarimeters
polarization
prisms
thin films
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description 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 . Visible designs include a GaP-coated NC fourth-order pellicle and a bilayer-coated glass prism at and near the wavelength. Operation of these beamsplitters over a range of incidence angles, wavelengths, and in the presence of film thickness errors is also considered.
doi_str_mv 10.1117/1.1951587
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subjects beamsplitters
coatings
ellipsometry
gallium phosphide
infrared
pellicles
polarimeters
polarization
prisms
thin films
title Bilayer pellicle and bilayer-coated prism beamsplitters for the division-of-amplitude photopolarimeter
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