温度对双光子亮屏蔽光伏孤子自偏转的影响

为了研究温度对双光子光伏光折变介质中亮屏蔽光伏孤子动态演化及自偏转特性的影响,采用数值模拟的方法,得到了亮屏蔽光伏孤子的动态演化过程。结果表明,在一定温度变化范围内,随着温度的升高,介质支持的亮屏蔽光伏孤子的光强和半峰全宽均减小;当介质的温度变化不大时,孤子将克服较小的扰动而保持稳定的孤子传播,当温度变化足够大时,孤子将变得不稳定甚至崩溃;在一定温度范围内,孤子中心的自偏转距离随着温度的升高而增加,在特定温度下达到最大值,之后随着温度的升高而减小。这些结果对双光子空间孤子的理论发展具有一定的意义。

Temperature effects on the self-deflection of two-photon bright screening-photovoltaic solitons

Temperature effects on the dynamical evolution and self-deflection characteristics of bright screening-photovoltaic spatial solitons in two-photon photovoltaic photorefractive media were investigated by taking into account the temperature dependence of both diffusion effects and dark irradiation. Taking the bright solitons as the input solitary beam, numerically solving the beam propagation equation, it is found that, the intensity profile and the full-width at half maximum (FWHM) of bright screening-photovoltaic spatial solitons are decrease with the raising of the temperature. When the temperature of crystals is changed in a less range, the stability of solitons can be persisted by overcoming the less perturbation. Solitons will become unstable or collapse when temperature of crystals is changed in a large range. The results show that the bending distance of the bright solitary beam centre increases with temperature rise, then reaches its maximum value at a specific temperature, and after that, decreases as temperature continuously rises.