Measurement of thermal expansion and thermo-optic coefficients in LiNbO<sub>3</sub> and KTiOPO<sub>4</sub> crystals using dual-interferometric techniques

Felice Pignatiello; Maurizio De Rosa; Pietro Ferraro; Simonetta Grilli; Sergio De Nicola; Ady Arie; Paolo De Natale

doi:10.1117/12.695504

15 September 2006 Measurement of thermal expansion and thermo-optic coefficients in LiNbO₃ and KTiOPO₄ crystals using dual-interferometric techniques

Felice Pignatiello, Maurizio De Rosa, Pietro Ferraro, Simonetta Grilli, Sergio De Nicola, Ady Arie, Paolo De Natale

Author Affiliations +

Proceedings Volume 6341, Speckle06: Speckles, From Grains to Flowers; 63412H (2006) https://doi.org/10.1117/12.695504
Event: Speckle06: Speckles, From Grains to Flowers, 2006, Nimes, France

Abstract

We describe a dual-interferometric setup for simultaneous and independent measurement of the thermal expansion coefficient and thermo-optic coefficients in ferroelectric crystals (LiNbO₃ and KTiOPO₄). The crystal temperature varies from room temperature up to 200°C by an actively stabilized oven. The thermal expansion coefficient is determined using a moire interferometer and monitoring, as a function of the temperature, the period of a grating written on one side of the crystal sample. The thermo-optic coefficients of the ordinary and extraordinary axes of LiNbO₃ crystal are estimated by measuring the optical path variation measured using a Mach-Zehnder interferometer.

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Felice Pignatiello, Maurizio De Rosa, Pietro Ferraro, Simonetta Grilli, Sergio De Nicola, Ady Arie, and Paolo De Natale "Measurement of thermal expansion and thermo-optic coefficients in LiNbO₃ and KTiOPO₄ crystals using dual-interferometric techniques", Proc. SPIE 6341, Speckle06: Speckles, From Grains to Flowers, 63412H (15 September 2006); https://doi.org/10.1117/12.695504

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