Interferometric measurements of thermo-optic coefficients of ZnS, CaF2, and Ge in the infrared

Jacques Mangin; Pierre Strimer; Marc Schillinger; Jean-Louis P. Meyzonnette; Jacques Thebault; C. Aymonier

doi:10.1117/12.246739

19 August 1996 Interferometric measurements of thermo-optic coefficients of ZnS, CaF₂, and Ge in the infrared

Jacques Mangin, Pierre Strimer, Marc Schillinger, Jean-Louis P. Meyzonnette, Jacques Thebault, C. Aymonier

Proceedings Volume 2775, Specification, Production, and Testing of Optical Components and Systems; (1996) https://doi.org/10.1117/12.246739
Event: Optical Instrumentation and Systems Design, 1996, Glasgow, United Kingdom

Abstract

The thermo-optic coefficient (delta) n divided by (delta) T of CaF₂, ZnS and Ge single crystals have been measured in the infrared from 20 degrees C to 100 degrees C. The laser interferometric method employed allows a determination of (delta) n divided by (delta) T with an accuracy close to 10^-6K^-1 in the case of nonabsorbing materials. For Ge the uncertainty is increased by a factor of 3 and is mainly due to its increasing absorption coefficient with temperature. The behavior of ZnS was examined at 1.06 micrometers and 10.6 micrometers laser radiations; CaF₂ and Ge were investigated respectively at 1.06 micrometers and 10.6 micrometers.

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Jacques Mangin, Pierre Strimer, Marc Schillinger, Jean-Louis P. Meyzonnette, Jacques Thebault, and C. Aymonier "Interferometric measurements of thermo-optic coefficients of ZnS, CaF₂, and Ge in the infrared", Proc. SPIE 2775, Specification, Production, and Testing of Optical Components and Systems, (19 August 1996); https://doi.org/10.1117/12.246739

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