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Measurement of the thermal expansion coefficients of ferroelectric crystals by a moiré interferometer |
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| Authors: | F. Pignatiello M. De Rosa P. Ferraro S. Grilli P. De Natale A. Arie |
| Affiliation: | a CNR, Istituto Nazionale di Ottica Applicata, Sezione di Napoli, Via Campi Flegrei 34, 80078 Pozzuoli (NA), Italy b LENS, European Laboratory for Non-linear Spectroscopy, Via Campi Flegrei 34, 80078 Pozzuoli (NA), Italy c Department of Physical Electronics, School of Electrical Engineering, Faculty of Engineering, Tel-Aviv University, Tel-Aviv 69978, Israel d CNR, Istituto di Cibernetica “E.Caianiello”, Via Campi Flegrei 34, 80078 Pozzuoli (NA), Italy |
| Abstract: | A moiré interferometer is used to measure the thermal expansion of two ferroelectric crystals, LiNbO3 and KTiOPO4. The crystal samples are patterned with a chromium reflective grating and used as a diffractive component in a reflective grating interferometer. The thermal expansion of all the three axes of congruent LiNbO3 and of x and y axes of the flux-grown KTiOPO4 were measured from room temperature to 200 °C. For this temperature range the thermal expansion coefficient has been modeled by a second-order polynomial and its coefficients have been estimated by accurate analysis of the resulting moiré fringe pattern. |
| Keywords: | Moiré interferometry Ferroelectric Thermal expansion |
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