A polarization modulator for the far infrared (terhahertz waves)

Theodore C. Oakberg; Tsuyoshi Akiyama; Kazuya Nakayama

doi:10.1117/12.731827

13 September 2007 A polarization modulator for the far infrared (terhahertz waves)

Theodore C. Oakberg, Tsuyoshi Akiyama, Kazuya Nakayama

Proceedings Volume 6682, Polarization Science and Remote Sensing III; 66820X (2007) https://doi.org/10.1117/12.731827
Event: Optical Engineering + Applications, 2007, San Diego, California, United States

Abstract

Photoelastic modulator (PEM) based polarimeters have been used for plasma diagnostics of magnetically confined fusion devices for over 15 years. With the invention of a new laser operating at 47.7 and 57.2 microns, using this radiation for plasma diagnostics has become possible, providing that PEMs can be made for these wavelengths of radiation. Recently, a PEM has been made which meets these requirements. The device uses a silicon optical element with a single-layer polymer anti-reflective coating. Design decisions during the development and performance characteristics of the new PEM will be discussed. Topics include the choice of silicon as an optical element material, antireflective coating design and material choice, optical transmission, maximum retardation, useful aperture and modulation frequency.

Citation Download Citation

Theodore C. Oakberg, Tsuyoshi Akiyama, and Kazuya Nakayama "A polarization modulator for the far infrared (terhahertz waves)", Proc. SPIE 6682, Polarization Science and Remote Sensing III, 66820X (13 September 2007); https://doi.org/10.1117/12.731827

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