中国物理B ›› 1996, Vol. 5 ›› Issue (9): 670-676.doi: 10.1088/1004-423X/5/9/005

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TWO-WAVE COUPLING IN PHOTOREFRACTIVE TRANSITION METAL DOPED POTASSIUM SODIUM BARIUM STRONTIUM NIOBATE CRYSTALS

朱德瑞, 张曰理, 莫党   

  1. Department of Physics, Zhongshan University, Guangzhou 510275, China
  • 收稿日期:1995-07-03 出版日期:1996-09-20 发布日期:1996-09-20
  • 基金资助:
    Project supported in part by the National Natural Science Foundation of China.

TWO-WAVE COUPLING IN PHOTOREFRACTIVE TRANSITION METAL DOPED POTASSIUM SODIUM BARIUM STRONTIUM NIOBATE CRYSTALS

ZHU DE-RUI (朱德瑞), ZHANG YUE-LI (张曰理), MO DANG (莫党)   

  1. Department of Physics, Zhongshan University, Guangzhou 510275, China
  • Received:1995-07-03 Online:1996-09-20 Published:1996-09-20
  • Supported by:
    Project supported in part by the National Natural Science Foundation of China.

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摘要： Large values of the exponential gain coefficient are obtained (Γ= 8-20cm-1) in photorefractive potassium sodium barium strontium niobate crystals doped with transition metal elements: Co, Gu, Fe, Cr and Ni by using two-wave coupling experiments with argon ion laser (λ = 488nm). The response time is measured to be 60-1000ms at an intensity of 5W/cm2 for various samples. We find that in all the crystals electrons are the dominant photorefractive charge carriers, and the typical density of carriers is 1016-1017 cm-3.

Abstract: Large values of the exponential gain coefficient are obtained ($\varGamma$= 8-20cm-1) in photorefractive potassium sodium barium strontium niobate crystals doped with transition metal elements: Co, Gu, Fe, Cr and Ni by using two-wave coupling experiments with argon ion laser ($\lambda$ = 488nm). The response time is measured to be 60-1000ms at an intensity of 5W/cm2 for various samples. We find that in all the crystals electrons are the dominant photorefractive charge carriers, and the typical density of carriers is 1016-1017 cm-3.

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

  • 42.70.Nq
78.20.Ci (Optical constants (including refractive index, complex dielectric constant, absorption, reflection and transmission coefficients, emissivity)) 72.20.Jv (Charge carriers: generation, recombination, lifetime, and trapping) 72.80.Sk (Insulators)