High-precision Tunable Retardation Plate for Use with Visible and Ultra-violet Polarized Light

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Abstract
A variable retardation plate suitable for polarizing optics in the visible and ultra-violet has been developed. It is based on the photoelastic effect induced by lateral compression of a rectangular plate of fused silica. A special pressure frame employing hydraulic pressure gives very even compression, and the stress pattern induced is uniform to within 1 per cent over most of the plate area. A pneumatic ballast system has also been developed to stabilize the pressure, which maintains the retardation constant to within ½ per cent over a period of hours. Possible applications of the retardation plate in optical instrumentation and in the accurate measurement of pressure are discussed.

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