Light-induced acoustic effect in LiNbO3:Fe:Ce crystals
Huang Wei (黄伟)a, Wu Zhong-Kang (吴仲康)b, Wang Chang-Qing (王长青)c
a Department of Basic, Beijing Institute of Civil Engineering and Architecture, Beijing 100044, China; b Photonics Center, Department of Physics, Nankai University, Tianjin 300071, China; c Institute of Crystal Materials, National Key Laboratory of Crystal Materials, Shandong University, Jinan 250100, China
Abstract The phenomena of acoustic emission in LiNbO3:Fe:Ce crystals have been observed in the process of light-induced quasi-breakdown. It is found that the ultra-high frequency acoustic signal introduced into the crystal is modulated by the low frequency acoustic waves. Its frequency increases with the increase 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 $\Delta n$ and the diffracted light intensity L. This phenomenon has been analysed in this paper, which is caused by the inverse piezoelectric strain effect of the jump of space charge field during the quasi-breakdown.
Received: 30 November 2004
Revised: 13 April 2005
Accepted manuscript online:
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