Birefringence of Optical Materials in the Infrared Region

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Abstract
The paper describes a method for measuring birefringence in the I.R. region. The sample disc is rotated between crossed I.R. polarizers and birefringence determined from the amplitude of the resulting sinusoidal signal. The following theoretical description makes allowance for the residual transmittance of the polarizers and the transmittance of the sample disc. The method is used to determine birefringence in optical materials in the spectral region between 8 and 12 wm. The paper also describes a simplified technique for measuring the distribution of birefringence over a sample disc.

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