中国物理B ›› 2000, Vol. 9 ›› Issue (11): 841-843.doi: 10.1088/1009-1963/9/11/009

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OBSERVATION OF PHOTOREFRACTIVE EFFECT OF KNbO3 CRYSTAL AT μW ILLUMINATION

王锋1, 龚旗煌1, 夏宗璜2, 卢希庭2, 沈德忠3, 李旗4   

  1. (1)Department of Physics, Peking University, Beijing 100871, China; (2)Department Technical Physics, Peking University, Beijing 100871, China; (3)Research Institute of Synthetic Crystals, Beijing 100018, China; (4)State Key Laboratory of Solid State Microstructures and Department of Physics, Nanjing University, Nanjing 210093, China; Department Technical Physics, Peking University, Beijing 100871, China
  • 收稿日期:2000-05-14 出版日期:2000-11-15 发布日期:2005-06-12
  • 基金资助:
    Project supported by the Chinese Postdoctoral Foundation and by the Laboratory of Heavy-ion Physics Institute, Peking University, China.

OBSERVATION OF PHOTOREFRACTIVE EFFECT OF KNbO3 CRYSTAL AT μW ILLUMINATION

Li Qi (李旗)ab, Xia Zong-huang (夏宗璜)b, Lu Xi-ting (卢希庭)b, Wang Feng (王锋)c, Gong Qi-huang (龚旗煌)c, Shen De-zhong (沈德忠)d   

  1. a State Key Laboratory of Solid State Microstructures and Department of Physics, Nanjing University, Nanjing 210093, China;  b Department Technical Physics, Peking University, Beijing 100871, China;  c Department of Physics, Peking University, Beijing 100871, China;  d Research Institute of Synthetic Crystals, Beijing 100018, China
  • Received:2000-05-14 Online:2000-11-15 Published:2005-06-12
  • Supported by:
    Project supported by the Chinese Postdoctoral Foundation and by the Laboratory of Heavy-ion Physics Institute, Peking University, China.

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摘要： The photorefractive effects of the as-grown and proton-implanted KNbO3 crystals were studied by two-wave mixing at 62.2μW/cm2 illumination. At this pump power level, the as-grown crystal showed little photorefractive effect, while the proton-implanted crystal showed an obvious effect. Furthermore, there seemed to exist two photorefractive gratings with response times of 22.54 and 1596.30s, at 62.2μW/cm2 pump power level, in the proton-implanted sample. This phenomenon has been attributed to the influence of proton-implantation.

Abstract: The photorefractive effects of the as-grown and proton-implanted KNbO3 crystals were studied by two-wave mixing at 62.2μW/cm2 illumination. At this pump power level, the as-grown crystal showed little photorefractive effect, while the proton-implanted crystal showed an obvious effect. Furthermore, there seemed to exist two photorefractive gratings with response times of 22.54 and 1596.30s, at 62.2μW/cm2 pump power level, in the proton-implanted sample. This phenomenon has been attributed to the influence of proton-implantation.

Key words: ion-implantation, photorefractive effect, ferroelectric crystals

中图分类号:  (Phase conjugation; photorefractive and Kerr effects)

  • 42.65.Hw
42.70.Nq (Other nonlinear optical materials; photorefractive and semiconductor materials) 61.80.Jh (Ion radiation effects) 72.20.Jv (Charge carriers: generation, recombination, lifetime, and trapping)