中国物理B ›› 1994, Vol. 3 ›› Issue (7): 506-511.doi: 10.1088/1004-423X/3/7/004

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A STUDY ON REAL-TIME LOW-FREQUENCY SPATIAL FILTERING PROCESS OF AN OPTICAL IMAGE USING LiNbO3:Fe CRYSTAL

陆猗1, 刘思敏2, 陈海东2, 刘军民2, 许京军2, 张光寅2, 门丽秋2, 孙骞2, 杨立森3   

  1. (1)Department of Physics, Branch College of Tianjin University, Tianjin 300193, China; (2)Department of Physics, Nankai University, Tianjin 300071, China; (3)Department of Physics, Neimenggu Normal University, Huhhot 010020, China
  • 收稿日期:1992-09-02 修回日期:1993-08-30 出版日期:1994-07-20 发布日期:1994-07-20
  • 基金资助:
    Project supported by the National Natural Science Foundation of China and by the State Science and Technology Commission of China, through a grant for key research project in climbing program.

A STUDY ON REAL-TIME LOW-FREQUENCY SPATIAL FILTERING PROCESS OF AN OPTICAL IMAGE USING LiNbO3:Fe CRYSTAL

LIU SI-MIN (刘思敏), LU YI (陆猗)a, CHEN HAI-DONG (陈海东), LIU JUN-MIN (刘军民), XU JING-JUN (许京军), ZHANG GUANG-YIN (张光寅), YANG LI-SEN (杨立森)b, MEN LI-QIU (门丽秋), SUN QIAN (孙骞)   

  1. Department of Physics, Nankai University, Tianjin 300071, China;  a Department of Physics, Branch College of Tianjin University, Tianjin 300193, China; b Department of Physics, Neimenggu Normal University, Huhhot 010020, China
  • Received:1992-09-02 Revised:1993-08-30 Online:1994-07-20 Published:1994-07-20
  • Supported by:
    Project supported by the National Natural Science Foundation of China and by the State Science and Technology Commission of China, through a grant for key research project in climbing program.

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摘要： The optimum image processing result of low-frequency filtering was obtained when LiNbO3:Fe crystal as a spatial filter was placed at a certain position behind the spatial-frequency spectral plane of an optical Fourier transform system, which corresponds to the minimum transmittance ratio in Z-scan curve. The experimental results show that self-defocusing due to photorefractive negative-lens effect is the main factor responsible for the low- frequency filtering.

Abstract: The optimum image processing result of low-frequency filtering was obtained when LiNbO3:Fe crystal as a spatial filter was placed at a certain position behind the spatial-frequency spectral plane of an optical Fourier transform system, which corresponds to the minimum transmittance ratio in Z-scan curve. The experimental results show that self-defocusing due to photorefractive negative-lens effect is the main factor responsible for the low- frequency filtering.

中图分类号:  (Filters, zone plates, and polarizers)

  • 42.79.Ci
42.79.Bh (Lenses, prisms and mirrors) 42.30.Kq (Fourier optics) 42.30.Va (Image forming and processing) 42.70.Nq (Other nonlinear optical materials; photorefractive and semiconductor materials)