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Proceedings Paper

Infrared polarizing beam-splitters for the 7 to 13 um spectral region
Author(s): Li Li; Jean-Marc Thériault; Yanen Guo
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Paper Abstract

High performance infrared polarizing beam-splitters (PBS) with broad bands and wide angular fields are required for IR applications that use both transmitted and reflected polarizing beams equally from 3 to 14 μm. Existing infrared wire grid polarizers do not meet the requirements because they have good performance only in transmission, not in reflection. No practical IR PBS devices are yet available for this spectral region. In this paper, we propose to fabricate an infrared thin film polarizing beam-splitters based on previously described light interference and frustrated total internal reflection. The PBS coatings consist of Ge and fluorite layers on ZnSe prism substrates. Similar high performance PBS designs have been successfully made in the visible. However, it is more challenging to make such PBSs in the infrared region, mostly due to the use of soft IR coating materials, the low energy evaporation process and the optical contacting bonding technique. In the paper, we will report for the first time the measured performance of a prototype IR PBS for the 7-13 μm spectral region with an angular field ±7.82° in air. We will also discuss the challenges in fabricating the prototype PBS, including optical constant characterization and device measurements.

Paper Details

Date Published: 3 October 2011
PDF: 9 pages
Proc. SPIE 8168, Advances in Optical Thin Films IV, 816811 (3 October 2011); doi: 10.1117/12.896940
Show Author Affiliations
Li Li, National Research Council Canada (Canada)
Jean-Marc Thériault, Defence Research and Development Canada (Canada)
Yanen Guo, National Research Council Canada (Canada)

Published in SPIE Proceedings Vol. 8168:
Advances in Optical Thin Films IV
Michel Lequime; H. Angus Macleod; Detlev Ristau, Editor(s)

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