中国物理B ›› 2005, Vol. 14 ›› Issue (11): 2231-2234.doi: 10.1088/1009-1963/14/11/015

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Light-induced acoustic effect in LiNbO3:Fe:Ce crystals

黄伟1, 王长青2, 吴仲康3   

  1. (1)Department of Basic, Beijing Institute of Civil Engineering and Architecture, Beijing 100044, China; (2)Institute of Crystal Materials, National Key Laboratory of Crystal Materials, Shandong University, Jinan 250100, China; (3)Photonics Center, Department of Physics, Nankai University,Tianjin 300071, China
  • 收稿日期:2004-11-30 修回日期:2005-04-13 出版日期:2005-11-20 发布日期:2005-11-20
  • 基金资助:
    Project supported by the National Natural Science Foundation of China (Grant No 69908003).

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    

  1. 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
  • Received:2004-11-30 Revised:2005-04-13 Online:2005-11-20 Published:2005-11-20
  • Supported by:
    Project supported by the National Natural Science Foundation of China (Grant No 69908003).

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摘要： 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.

关键词: photovoltaic current, photo-refractive, space charge field, light induced quasi-breakdown

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.

Key words: photovoltaic current, photo-refractive, space charge field, light induced quasi-breakdown

中图分类号:  (Acoustical properties of solids)

  • 62.65.+k
43.40.Le (Techniques for nondestructive evaluation and monitoring, acoustic emission) 77.65.Ly (Strain-induced piezoelectric fields)