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Infrared Polarizer

IP.com Disclosure Number: IPCOM000095580D
Original Publication Date: 1964-Mar-01
Included in the Prior Art Database: 2005-Mar-07
Document File: 2 page(s) / 24K

Publishing Venue

IBM

Related People

Klauser, HE: AUTHOR

Abstract

This polarizer for electromagnetic radiation uses three consecutive reflections at germanium-mercury interfaces. Such arrangement is an efficient, compact device and permits the exit beam to be on the same axis as the incident beam.

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Infrared Polarizer

This polarizer for electromagnetic radiation uses three consecutive reflections at germanium-mercury interfaces. Such arrangement is an efficient, compact device and permits the exit beam to be on the same axis as the incident beam.

The polarizer is machined from a cylindrical piece of germanium to produce five highly polished surfaces A, B, C, D and E, each perpendicular to the plane of the drawing. Beam incident surface A and exit surface E are in contact with air. Reflective surfaces B, C and D are in contact with mercury. Infrared radiation enters along line F at surface A and is successively reflected internally and polarized at interfaces B, C and D, leaving the polarizer at surface E.

Each germanium-mercury interface performs a degree of polarization on the incident beam. This is due to the difference in coefficients of reflection for the parallel and perpendicular components of reflected radiation. Surface C can be a germanium-air interface to increase exit beam intensity, when a lesser degree of polarization can be used.

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