Mechanisms for optical oscillations in ferroelectric films

O'Sullivan, R, McGregor, K, Gredeskoul, O and Scott, J 2001, 'Mechanisms for optical oscillations in ferroelectric films', Journal of the European Ceramic Society, vol. 21, no. 10-11, pp. 1625-1628.


Document type: Journal Article
Collection: Journal Articles

Title Mechanisms for optical oscillations in ferroelectric films
Author(s) O'Sullivan, R
McGregor, K
Gredeskoul, O
Scott, J
Year 2001
Journal name Journal of the European Ceramic Society
Volume number 21
Issue number 10-11
Start page 1625
End page 1628
Total pages 3
Publisher Elsevier
Abstract Under steady laser illumination, aperiodic spatio-temporal oscillations are observed in the light transmitted and reflected by parallel-sided samples of the ferroelectrics PMN (lead magnesium niobate, Pb(Mg1/3Nb2/3)O3), PLZT (lanthanum doped lead zirconium titanate, Pb(Zr1-xTix)O3:La), BNN (barium sodium niobate, Ba2NaNb5O15) and Ce:SBN (cerium doped strontium barium niobate, Ce3+:SrxBa1-xNb2O6). There are two distinct mechanisms for such oscillations, namely (1) unistable thermal focusing oscillations, which occur in BNN and Ce:SBN and (2) bistable or multistable Fabry-Perot switching oscillations, as observed in PMN and PLZT. The two types of oscillation have characteristic time scales differing by several orders of magnitude. We derive temperature profiles as a function of incident laser power, beamwidth and sample thickness, which quantitatively predict the spatio-temporal characteristics of the transmitted beam patterns.
DOI - identifier 10.1016/S0955-2219(01)00079-6
Copyright notice © 2001 Elsevier Science Ltd.
ISSN 0955-2219
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