Theoretical study of the intensity dependence of two-beam coupling gain coefficient in photorefractive crystals

JI Xuan-mang; AN Yu-ying; LIU Jin-song

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Theoretical study of the intensity dependence of two-beam coupling gain coefficient in photorefractive crystals

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- Theoretical study of the intensity dependence of two-beam coupling gain coefficient in photorefractive crystals
- Optics and Precision Engineering Vol. 9, Issue 1, Pages: 51-54(2001)
- 作者机构：
  
  1. 山西运城高等专科学校物理系, 山西运城, 044000
  2. 西安电子科技大学技术物理学院, 陕西西安, 710071
- 作者简介：
- 基金信息：
- DOI：
  CLC： O437
- Received：12 July 2000，
  
  Published Online：15 February 2001，
  
  Published：15 February 2001
- 稿件说明：
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吉选芒, 安毓英, 刘劲松. 光折变晶体两波耦合增益系数强度特性理论研究[J]. 光学精密工程, 2001,(1): 51-54

JI Xuan-mang, AN Yu-ying, LIU Jin-song. Theoretical study of the intensity dependence of two-beam coupling gain coefficient in photorefractive crystals[J]. Editorial Office of Optics and Precision Engineering, 2001,(1): 51-54
吉选芒, 安毓英, 刘劲松. 光折变晶体两波耦合增益系数强度特性理论研究[J]. 光学精密工程, 2001,(1): 51-54 DOI：

JI Xuan-mang, AN Yu-ying, LIU Jin-song. Theoretical study of the intensity dependence of two-beam coupling gain coefficient in photorefractive crystals[J]. Editorial Office of Optics and Precision Engineering, 2001,(1): 51-54 DOI：

摘要

对两中心模型光折变晶体两波耦合增益系数Γ

总的有效陷阱密度

eff

和强度特性因子η(

)的强度特性进行了理论研究。结果显示在两中心模型的光折变晶体中

eff

和η(

)有着复杂的特性。当

小时

对于A类和B类两中心晶体

eff

随强度的增加而增加最终趋于饱和

当

大时

对于A类晶体

eff

增加到一个最大值后稍有减少

而对于B类晶体

eff

增加到最大值后然而有较大的减少。不同类型晶体增益系数Γ有着不同的强度特性是由于晶体中有着不同的能级结构。

Abstract

Intensity dependence of the two-beam coupling gain coefficient Γ

the effective trap density

eff

and the intensity dependent factor η(

) is studied theoretically for the two-centre photorefractive crystals. The results show that

eff

η(

) and Γ have more complicated behaviors in two-centre crystals. When

is small

eff

increases and tends to saturate with increasing intensity for both type-A and type-B two-centre crystals. When

is large

eff

increases to a maximum and then decreases a little for type-A crystals and decreases greatly for type-B crystals.The different intensity dependence of Γ in the two types of crystals comes from their different level structures.

关键词

Keywords

references

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吉选芒,王金来,安毓英,刘劲松.热效应对光折变晶体双光束耦合特性影响的参数理论分析[J].光学学报,1998,18 (3):291-295.

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Chi Mingjun, Dou S X, Zhu Yong, Ye Peixian.Wavelength dependen ce of the effective trap density in Rh-doped BaTiO３:a comparison between theor y and experiment.[J].Opt. Commun, 1999,170(11):115-120.

Machgerefth D,Feinberg J.Explanation of the apparent sublinea r photoconductivity of photorefractive barium titanate[J]. Phys. Rev. Lett.,1 990,64:2195-2199.

CHI Ming-Jun, Dou shuo-xing, Ye Pei-xian.Theoretical study of the intensity dependence of total effective trap density in photorefractive crystals[J]. Acta Physica Sinica, 1999,8(9):664-669.

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