Open AccessAnomalous index modulations in electrooptic KTa_1-xNbxO_3 single crystals in relation to electrostrictive effect
Author(s) -
T. Imai,
S. Kawamura,
Tadashi Sakamoto
Publication year - 2015
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.23.028784
Subject(s) - refractive index , electrostriction , distortion (music) , optics , kerr effect , physics , beam (structure) , light beam , anomaly (physics) , materials science , condensed matter physics , quantum mechanics , optoelectronics , amplifier , cmos , nonlinear system , piezoelectricity , acoustics
KTa(1-x)Nb(x)O(3) is known for its huge Kerr effect, which is a second order electrooptic (EO) effect. By utilizing the large refractive index change Δn of this EO effect, a fast optical beam deflector has been realized. However, anomalous spatial distributions of Δn were observed with this beam deflector. This anomaly is ascribed to distortions caused by the electrostrictive effect that occurs when voltage is applied. We assumed a spheric distortion and used a variational method to deduce an analytic solution for the strains that accompany this distortion. The analytic solution coincides with numerical results obtained with the finite element method. In addition, the solution agrees well with the experimentally obtained Δn distribution.