双光子光折变介质中非相干耦合亮-暗混合屏蔽孤子族

Incoherently-coupled bright-dark hybrid screening spatial soliton families in biased two-photon photorefractive medium

根据光波耦合方程及亮-暗孤子对解,对稳态情况下多束互不相干的光束在有外加电场的双光子非光伏光折变晶体中的传播进行分析,给出产生亮-暗双光子光折变屏蔽光伏孤子族需满足的条件。证明有外加电场双光子非光伏光折变晶体中存在非相干耦合亮-暗混合屏蔽孤子族,孤子族由偏振态和波长都相同的多束互不相干的光形成。当外加电场方向和晶体光轴方向相同时,双光子光折变晶体可支持亮孤子族总峰值光强稍大于暗孤子族总峰值光强的的非相干耦合亮-暗混合孤子族,当外加电场方向与晶体光轴方向相反时,双光子光折变晶体可支持亮孤子族总峰值光强稍小于暗孤子族总峰值光强的非相干耦合亮-暗混合孤子族。

The propagation of multiple incoherent beams in biased two-photon non-photovoltaic photorefractive crystal is investigated under steady-state conditions.It shows that the two-photon incoherently-coupled bright-dark hybrid screening soliton families exist in the biased two-photon non-photovoltaic photorefractive crystals,and that the soliton families are formed by the mutually incoherent beams which have same polarization and wavelength.Moreover,two-photon photorefractive crystals,whose optical axis direction is same to the direction of the external field,can support bright-dark soliton families in which the peak intensity of the bright component is slightly larger than that of the dark component.When the direction of the applied electric field is reversed to that of the optical axis,the two-photon photorefractive crystals can support the bright-dark soliton families in which the peak intensity of the bright component is slightly lower than that of dark component.