Abstract

We have observed birefringence in chalcogenide glasses As2S3, As2S2Se1, As2S1Se2, As2Se3, and As2Se2Te1 by using infrared radiation, usually of wavelength 1.44 μm. The glasses were obtained as narrow, horizontally cooled ingots, and the birefringence is believed to be associated with the direction of temperature gradients during cooling. The birefringence is weak; values of (n1n2) have been measured on various samples and found to be generally ~10−4. It is suggested that there are contributions to the birefringence from strain (easily removed by annealing) and from some ordering of the structure (more permanent). The variation of (n1n2) with wavelength has been measured; a simple explanation based on a modification of a one oscillator model is discussed.

© 1982 Optical Society of America

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