Effect of the o-polarized irradiation on the screening-photovoltaic photorefractive spatial solitons
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摘要: 为了得到o偏振光对光折变屏蔽光伏空间孤子影响的结果,基于单光子光折变效应理论模型,建立了有分压电阻和o偏振均匀背景光辐照的光伏光折变晶体中的屏蔽光伏空间孤子理论。结果表明,当外加电场和光伏场的取值使晶体中形成暗孤子时,仅改变o背景光与孤子光的有效glass系数之比即可在晶体中获得明孤子;孤子的强度半峰全宽随o背景光强度与暗辐射强度比值的增大而增大,随o背景光与孤子光电离截面的比值的增大而增大。这从理论上为实现光折变晶体中暗孤子到明孤子的转换提供了一种全新的思路。Abstract: In order to study effect of the o-polarized irradiation on the screening-photovoltaic spatial solitons,the theory of screening-photovoltaic spatial solitons was established based on the one-photon photorefractive effect.The optical circuit includes a divider resistance and an o-polarized uniform background beam.The numerical results show that the dark solitons can be obtained for the proper values of biased field and photovoltaic field and the bright solitons can also be obtained by only changing the value of effective glass coefficient between o-background beam and soliton beam while the other parameters remain unchanged.The intensity full width at half maximum(FWHM)of solitons increases with the increase of the ratio of the o-background beam intensity to the dark-irradiation intensity.Similarly,the FWHM of solitons will also increase with the ratio of cross section of the o-background beam to that of the soliton beam.The paper gives a new scheme of the transformation of a dark soliton into a bright soliton in photorefractive crystal.
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