Abstract

Pile-of-plates polarizers made of thin sheets of polyethylene were constructed for use in a far-infrared spectrograph. The degree of polarization with 15 sheets is more than 97% except in the spectral region in which constructive interference of light reflected from both surfaces of a sheet increases the transmission of s component and decreases the polarization. The transmission is more than 75% of the incident plane polarized light. Limitations due to interference were decreased by combining polyethylene sheets of two thicknesses. The reflectivities of a filter grating, dispersion gratings, and reststrahlen crystals were measured for s and p plane polarized radiation.

© 1960 Optical Society of America

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