中国物理B ›› 2001, Vol. 10 ›› Issue (8): 739-742.doi: 10.1088/1009-1963/10/8/314

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INVESTIGATION OF PHOTOREFRACTIVE TWO-WAVE COUPLING IN Cr-DOPED STRONTIUM BARIUM NIOBATE CRYSTAL

赵建林1, 王彬1, 吴建军1, 杨德兴1, S. Kapphan2, R. Pankrath2   

  1. (1)Department of Applied Physics, Northwestern Polytechnical University, Xi'an 710072, China; (2)Universit?t Osnabrück, Fachbereich Physik, D- 49069 Osnabrück, Germany
  • 收稿日期:2000-12-19 修回日期:2001-02-22 出版日期:2001-08-15 发布日期:2005-06-12
  • 基金资助:
    Project supported by the "211" Project of Northwestern Polytechnical University. Part of this work was done in the Department of Physics at the University of Osnabrück in Germany, and supported by "SFB225" of DFG.

INVESTIGATION OF PHOTOREFRACTIVE TWO-WAVE COUPLING IN Cr-DOPED STRONTIUM BARIUM NIOBATE CRYSTAL

Zhao Jian-lin (赵建林)a, Wang Bin (王彬)a, Wu Jian-jun (吴建军)a, Yang De-xing (杨德兴)a, S. Kapphanb, R. Pankrathb   

  1. a Department of Applied Physics, Northwestern Polytechnical University, Xi'an 710072, China; b Universit?t Osnabrück, Fachbereich Physik, D- 49069 Osnabrück, Germany
  • Received:2000-12-19 Revised:2001-02-22 Online:2001-08-15 Published:2005-06-12
  • Supported by:
    Project supported by the "211" Project of Northwestern Polytechnical University. Part of this work was done in the Department of Physics at the University of Osnabrück in Germany, and supported by "SFB225" of DFG.

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摘要： We present here the experimental results of photorefractive two-wave coupling in the congruent strontium barium niobate (SBN:61) crystal doped with 1000ppm Cr. Employing a He－Ne laser (632.8nm), we observed the coupling characteristics under different conditions. The crystal shows excellent photorefractive properties, with a high coupling coefficient nearly 6cm-1 as the beam intensity ratio m is less than 100. The saturated coupling coefficient of SBN:61:Cr shows a maximum at a certain external beam crossing angle 2θpeak, which varies with different m, showing a nearly linear dependence on m. The saturated coupling response time τ is measured to be less than 0.8 s. The response time decreased with increasing beam crossing angles no matter how large m is. We also observed the behaviour of the probe beam in reversed experimental procedures. We found that the probe beam shows a bistable state in both procedures.

Abstract: We present here the experimental results of photorefractive two-wave coupling in the congruent strontium barium niobate (SBN:61) crystal doped with 1000ppm Cr. Employing a He－Ne laser (632.8nm), we observed the coupling characteristics under different conditions. The crystal shows excellent photorefractive properties, with a high coupling coefficient nearly 6cm-1 as the beam intensity ratio m is less than 100. The saturated coupling coefficient of SBN:61:Cr shows a maximum at a certain external beam crossing angle 2$\theta$peak, which varies with different m, showing a nearly linear dependence on m. The saturated coupling response time $\tau$ is measured to be less than 0.8 s. The response time decreased with increasing beam crossing angles no matter how large m is. We also observed the behaviour of the probe beam in reversed experimental procedures. We found that the probe beam shows a bistable state in both procedures.

Key words: photorefractive effect, SBN:Cr crystal, two-wave coupling, bistable state

中图分类号:  (Other nonlinear optical materials; photorefractive and semiconductor materials)

  • 42.70.Nq
78.20.Jq (Electro-optical effects) 42.65.Hw (Phase conjugation; photorefractive and Kerr effects) 42.65.Pc (Optical bistability, multistability, and switching, including local field effects) 42.55.Lt (Gas lasers including excimer and metal-vapor lasers)