双光子光折变介质中屏蔽空间孤子的温度特性

Temperature Effects on the Screening Spatial Solitons in Two-Photon Photorefractive Media

温度对具有双光子光折变效应的介质中屏蔽空间孤子的稳定性具有显著的影响。由屏蔽空间孤子演化方程得到的亮和暗屏蔽空间孤子解是温度相关的,在室温范围内,双光子光折变介质中屏蔽空间孤子光强和强度半峰全宽(FWHM)均受温度的影响而发生明显变化。随着温度的升高,双光子光折变介质中形成光强较小的亮和暗屏蔽空间孤子,在较大光强情况下,形成FWHM较小的亮屏蔽空间孤子;在小光强情况下,随着温度升高,双光子光折变介质中形成FWHM较大的亮和暗空间孤子;并且亮屏蔽空间孤子在介质中的空间偏移和角偏转都随温度的降低而增加。

The characteristic of screening spatial solitons in two-photon photorefractive media is influenced by media temperature.The light and dark screening spatial soliton solutions derived from the evolution equation of spatial solitions are temperature-dependent.The intensity profile and the full width at half maximum（FWHM） of screening spatial solitons in two-photon photorefractive media are strongly influenced by the media temperature in the room temperature range.By raising the media temperature,the screening spatial solitons with low intensity are formed, and moreover,the light and dark screening spatial solitons with narrow FWHM are formed under the high light intensity case,and the light and dark screening spatial solitons with wider FWHM are formed under the low light intensity case.The self-deflection of bright screening spatial solitons in crystals strongly depends on the temperature,and the spatial shift of the beam center and the deflection angle all increase with the dropping of the temperature.