双光子光折变材料中低振幅屏蔽光伏空间孤子

Low-amplitude screening-photovoltaic spatial solitons in two-photon photorefractive media

为了得到低振幅双光子屏蔽光伏空间孤子的结果,对外加电场的双光子光伏光折变介质中低振幅空间孤子进行了研究。给出了低振幅双光子屏蔽光伏亮和暗孤子的解析表达式,并推导出了孤子宽度的显式表达式。结果表明,低振幅双光子屏蔽光伏孤子可以看成是双光子低振幅屏蔽孤子和双光子低振幅光伏孤子的统一形式。当外加电场很强可忽略光伏效应时,它转化成低振幅屏蔽孤子;当外偏压为0时,它相当于开路或闭路的低振幅光伏孤子。该研究结果为空间光孤子理论的发展提供了理论依据。

In order to obtain low-amplitude two-photon sereening-photovoltaic spatial solitons, low-amplitude spatial solitons in biased two-photon photovoltaic photorefractive crystals were studied. Then, the analytical expressions for both the bright and dark low-amplitude two-photon screening-photovoltaic spatial solitons in photorefraetive crystals were obtained. The explicit expressions for the width of these spatial solitons were deduced. The result shows that the low-amplitude two-photon screeningphotovohaie solitons can be considered as the united form of screening solitons and photovohaic solitons. They reduce to screening soliton in the absence of photovoltaic effect, whereas they become photovoltaic solitons under the open or closed circuit condition when the bias field is not applied. It turned out that this research provides theoretic basis for development of the spatial solitons theory.