Optics Communications, volume 277, issue 1, pages 14-18
Measurement of the thermal expansion coefficients of ferroelectric crystals by a moiré interferometer
F Pignatiello
1
,
M. De Rosa
1
,
Pietro Ferraro
1
,
S Grilli
1
,
P. De Natale
1
,
Ady Arie
2
,
S. DE NICOLA
3
1
LENS, European Laboratory for Non-linear Spectroscopy, Via Campi Flegrei 34, 80078 Pozzuoli (NA), Italy
|
3
CNR, Istituto di Cibernetica “E.Caianiello”, Via Campi Flegrei 34, 80078 Pozzuoli (NA), Italy
|
Publication type: Journal Article
Publication date: 2007-09-01
Journal:
Optics Communications
scimago Q2
SJR: 0.538
CiteScore: 5.1
Impact factor: 2.2
ISSN: 00304018, 18730310
Electronic, Optical and Magnetic Materials
Physical and Theoretical Chemistry
Atomic and Molecular Physics, and Optics
Electrical and Electronic Engineering
Abstract
A moiré interferometer is used to measure the thermal expansion of two ferroelectric crystals, LiNbO 3 and KTiOPO 4 . 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 LiNbO 3 and of x and y axes of the flux-grown KTiOPO 4 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 .
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