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PERTURBATIVE ANALYSIS OF PHOTOREFRACTIVE MOVING GRATING AT LARGE MODULATION DEPTHS

FENG YU-WEN ZHOU ZHONG-XIANG JIANG YONG-YUAN SUN XIU-DONG XU KE-BIN

PERTURBATIVE ANALYSIS OF PHOTOREFRACTIVE MOVING GRATING AT LARGE MODULATION DEPTHS

FENG YU-WEN, ZHOU ZHONG-XIANG, JIANG YONG-YUAN, SUN XIU-DONG, XU KE-BIN
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  • Received Date:  21 August 1997
  • Published Online:  20 April 1998

PERTURBATIVE ANALYSIS OF PHOTOREFRACTIVE MOVING GRATING AT LARGE MODULATION DEPTHS

  • 1. 哈尔滨工业大学应用物理系,哈尔滨 150001

Abstract: We have discussed the recording of moving grating in photorefractive materials at large modulation depths using hopping model.The analytical expressions of the first three-order spatial charge field are presented which describe the nonstatic recording of the moving fringes.And the dependence of the space charge field on the veloctiy of the moving fringes is discussed for non diffusive field.We found that the higher-order harmonics of the space charge field for low diffusive field can be selectively enhanced with applied small dc field.Otherwise,they cannot be selectively enhanced if the diffusive field is large than the applied electric field.

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