Efficient Infrared Reflection Polarizers Using Transparent High-Index Films On Transparent Low-Index Substrates

R M. A . Azzam; T F Thonn

doi:10.1117/12.938397

13 October 1986 Efficient Infrared Reflection Polarizers Using Transparent High-Index Films On Transparent Low-Index Substrates

R M. A . Azzam, T F Thonn

Author Affiliations +

Proceedings Volume 0652, Thin Film Technologies II; (1986) https://doi.org/10.1117/12.938397
Event: 1986 International Symposium/Innsbruck, 1986, Innsbruck, Austria

Abstract

High-efficiency, p-suppressing, infrared reflection polarizers that employ a high-index transparent thin film on a low-index transparent substrate are described. Examples are given of such polarizers using infrared-transparent semiconductor films of Ge and Si on Irtran and glass substrates at the 2.8 μm (HF) and 3.8 pm (DF) laser wavelengths. The unextinguished power reflectance for the s polarization is high, as Z95 %, and is comparable to that of thin-film reflection polarizers that use metallic substrates. The effect of small changes (or errors) of film thickness, angle of incidence and wavelength on the extinction ratio of the device is also considered. Because of the high efficiency of the single-reflection polarizer, two, three or four such elements can be cascaded to achieve (1) parallelism or collinearity of the input and output beams, and (2) very low extinction ratio for the compound polarizer, while maintaining appreciable throughput for the passed (s) polarization component.

Citation Download Citation

R M. A . Azzam and T F Thonn "Efficient Infrared Reflection Polarizers Using Transparent High-Index Films On Transparent Low-Index Substrates", Proc. SPIE 0652, Thin Film Technologies II, (13 October 1986); https://doi.org/10.1117/12.938397

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