Silicon Brewster plate wavelength separator for a mid-IR optical parametric source

The availability of optical elements for the mid-infrared wavelength range, such as polarizers and wavelength separators, is limited especially when a broadband wavelength range coverage is required. We propose a polarizer based on uncoated silicon Brewster plates. A detailed analysis of the polariz...

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Bibliographic Details
Published in:Applied optics (2004) 2021-01, Vol.60 (2), p.281
Main Authors: Csanaková, Bianka, Novák, Ondřej, Smrž, Martin, Huynh, Jaroslav, Jelínková, Helena, Lucianetti, Antonio, Mocek, Tomáš
Format: Article
Language:English
Subjects:
Broadband
Misalignment
Optical components
Polarizers
Separators
Silicon
Wave plates
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Summary:The availability of optical elements for the mid-infrared wavelength range, such as polarizers and wavelength separators, is limited especially when a broadband wavelength range coverage is required. We propose a polarizer based on uncoated silicon Brewster plates. A detailed analysis of the polarizer's contrast and the influence of parasitic reflections, its dependence on wavelength, and the angular misalignment is shown. Two different arrangements of the two- and four-plate polarizers are discussed. With contrast including the influence of parasitic reflections of over 10 for the whole transparency range of silicon (1.2-6.5 µm), the four-plate polarizer is an effective, low-cost, high-power compatible tool providing sufficient contrast for signal and idler beam separation of the broadband mid-infrared Type II optical parametric sources. The proposed polarizers can function as an attenuator assembly without any wave plate.
ISSN:1559-128X
2155-3165
DOI:10.1364/AO.411408