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

Year: 2006

Authors: Pignatiello F., De Rosa M., Ferraro P., Grilli S., De Nicola S., Arie A., De Natale P.

Autors Affiliation: CNR – Istituto Nazionale di Ottica Applicata, Sez. di Napoli, Via Campi Flegrei 34, 80078 Pozzuoli (NA), Italy;
Istituto di Cibernetica “E. Caianiello” del CNR, Via Campi Flegrei 34, 80078 Pozzuoli (NA), Italy;
Department of Physical Electronics, School of Electrical Engineering, Faculty of Engineering, Tel Aviv University, 69978 Tel Aviv, Israel

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 degrees 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.

Journal/Review: PROCEEDINGS OF SPIE

Volume: 6341      Pages from: U540  to: U545

KeyWords: thermal expansion; lithium niobate;
DOI: 10.1117/12.695504

Citations: 3
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