Measurement of the thermal expansion coefficients of ferroelectric crystals by a moiré interferometer

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

Research output: Contribution to journalArticlepeer-review

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.

Original languageEnglish
Pages (from-to)14-18
Number of pages5
JournalOptics Communications
Volume277
Issue number1
DOIs
StatePublished - 1 Sep 2007

Keywords

  • Ferroelectric
  • Moiré interferometry
  • Thermal expansion

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