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Title

Aperiodic oscillations in thermal focussing by single crystals of lead magnesium niobate
Authors
O'Sullivan, Richard A.
Zheng, Xiping
Scott, James F.
Ye, Zuo-Guang
Schmid, Hans
Published in Ferroelectrics. 1996, vol. 186, no. 1-4, p. 17-20
Abstract Optical bistability in monocryst. Pb(Mg1/3Nb2/3)O3, (PMN) was studied at temps. near the ferroelec. phase transition under 514.5 nm illumination. At moderate laser power densities above a threshold but <100kW/cm2, this material exhibited reproducible aperiodic oscillations following the rapid switching on of a const.-intensity Gaussian laser beam. With increasing incident power the oscillations changed from the sym. type obsd. in PLZT to a sequence of rapid jumps followed by a slow relaxation between two metastable thermal lens configurations, similar to those obsd. in ceramic samples of PMN at lower power densities (~1 kW/cm2). The duration and no. of the oscillations depended reproducibly on incident power and ambient temp., with different spatial structures from those obsd. in ceramic samples, depending not only on incident beam power but also on incident beam width and wavefront curvature.
Keywords Laser radiation — Optical bistability lead magnesium niobate — Aperiodic oscillation laser irradn PMN
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Article (Published version) (254 Kb) - public document Free access
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Faculté des sciences / Section de chimie et biochimie / Département de chimie minérale, analytique et appliquée
Citation
(ISO format) 		O'SULLIVAN, Richard A. et al. Aperiodic oscillations in thermal focussing by single crystals of lead magnesium niobate. In: Ferroelectrics, 1996, vol. 186, n° 1-4, p. 17-20. https://archive-ouverte.unige.ch/unige:31143

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Deposited on : 2013-11-19

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