Birefringence in some chalcogenide glasses

V. N. Patel; J. T. Edmond

doi:10.1364/JOSA.72.000644

Journal of the Optical Society of America
Vol. 72,
Issue 5,
pp. 644-649
(1982)
•https://doi.org/10.1364/JOSA.72.000644

Birefringence in some chalcogenide glasses

V. N. Patel and J. T. Edmond

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V. N. Patel and J. T. Edmond, "Birefringence in some chalcogenide glasses," J. Opt. Soc. Am. 72, 644-649 (1982)

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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 (n₁ − n₂) 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 (n₁ − n₂) with wavelength has been measured; a simple explanation based on a modification of a one oscillator model is discussed.

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Material	(n₁ − n₂)
As₂S₃	0.93 × 10⁻⁴
As₂S₂Se₁	0.65 × 10⁻⁴
As₂SSe₂	1.22 × 10⁻⁴
As₂Se₃	0.67 × 10⁻⁴
As₂Se₂Te₁	1.00 × 10⁻⁴
As₂Se₃ Crystal	19.16 × 10⁻⁴

Sample Position in Ingot	Ingot Cooled in a Uniform Temp. Zone	Ingot Cooled in a Temp. Grad. Zone
End	0.81 × 10⁻⁴	0.31 × 10⁻⁴
Center	0.93 × 10⁻⁴	0.34 × 10⁻⁴
End	0.78 × 10⁻⁴	0.81 × 10⁻⁴
Specimen cut like X^a	0.93 × 10⁻⁴
Specimen cut like Y^a	1.89 × 10⁻⁴
Specimen cut like Z^a	1.24 × 10⁻⁴

Material	(n₁ − n₂)
As₂S₃	0.93 × 10⁻⁴
As₂S₂Se₁	0.65 × 10⁻⁴
As₂SSe₂	1.22 × 10⁻⁴
As₂Se₃	0.67 × 10⁻⁴
As₂Se₂Te₁	1.00 × 10⁻⁴
As₂Se₃ Crystal	19.16 × 10⁻⁴

Sample Position in Ingot	Ingot Cooled in a Uniform Temp. Zone	Ingot Cooled in a Temp. Grad. Zone
End	0.81 × 10⁻⁴	0.31 × 10⁻⁴
Center	0.93 × 10⁻⁴	0.34 × 10⁻⁴
End	0.78 × 10⁻⁴	0.81 × 10⁻⁴
Specimen cut like X^a	0.93 × 10⁻⁴
Specimen cut like Y^a	1.89 × 10⁻⁴
Specimen cut like Z^a	1.24 × 10⁻⁴

Abstract

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Equations (11)

Journal of the Optical Society of America