Excitation of Light-Induced Acoustic Waves in Doped Lithium Niobate Crystals
来源期刊：JOURNAL OF RARE EARTHS2006年增刊第1期
论文作者：Huang Wei Wu Zhongkang
Key words：photovoltaic current; space charge wave; light induced quasi-breakdown; light induced acoustic effect;
Abstract: The phenomena of acoustic emission in doped lithium niobate crystals were observed in the process of light-induced quasi-breakdown. It is found that the ultrasonic waves introduce into the crystal have been modulated by the low frequency acoustic waves. Its frequency increases with the rise of the intensity of incident light and its jump period of breakdown is the same as that of the photovoltaic current Ic, the change of light-induced refractive index Δn and the diffracted light intensity L. This effect was explained with the interaction of the three waves and resonant state theory. The experimental results and the theoretical analysis are in conformity.
Huang Wei1，Wu Zhongkang2
(1.Department of Basic, Beijing Institute of Civil Engineering and Architecture, Beijing 100044, China;
2.Department of Physic, Nankai University, Tianjin 300071, China)
Abstract:The phenomena of acoustic emission in doped lithium niobate crystals were observed in the process of light-induced quasi-breakdown. It is found that the ultrasonic waves introduce into the crystal have been modulated by the low frequency acoustic waves. Its frequency increases with the rise of the intensity of incident light and its jump period of breakdown is the same as that of the photovoltaic current Ic, the change of light-induced refractive index Δn and the diffracted light intensity L. This effect was explained with the interaction of the three waves and resonant state theory. The experimental results and the theoretical analysis are in conformity.
Key words:photovoltaic current; space charge wave; light induced quasi-breakdown; light induced acoustic effect;
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