双光子光折变介质中非相干耦合屏蔽光伏孤子对

Incoherently coupled screening-photovoltaic spatial soliton pairs in two-photon photorefractive media

为了获得在有外加电场的双光子光伏光折变介质中存在着稳态非相干耦合屏蔽光伏空间孤子对的结果,对外加电场的双光子光伏光折变介质中,两束偏振方向和波长都相同的互不相干光束的耦合进行了理论研究。结果表明,这种孤子对是由偏振态和波长都相同的两束互不相干光耦合而成的,它可以看成是双光子非相干屏蔽孤子对和双光子非相干光伏孤子对的统一形式,当外加电场很强可忽略光伏效应时,它类似于已报道的双光子屏蔽孤子对,而当外加电场为0时,它相当于闭路条件下的双光子光伏孤子对。这就预言了非相干耦合暗-暗和亮-亮双光子屏蔽光伏空间孤子对的存在。

In order to prove that there are steady-sate incoherent coupled screening-photovuhaie soliton pairs in biased two- photon photovoltaic photorefractive crystals under steady-state conditions, the coupling of two incoherent optical beams with the same polarization and wavelength in two-photon photovoltaic photorefractive crystals is theoretically studied. The result shows that these soliton pairs are established by the incoherent solitary beams with the same polarization and wavelength. The screening- photovohaic soliton pairs can be considered as the united form of screening soliton pairs and closed-circuit photovoltaic soliton pairs. They reduce to screening soliton pairs in the absence of photovohaic effect, whereas they become photovohaic soliton pairs under the closed circuit condition when the bias field is not applied. It is shown that incoherently coupled dark-dark and bright- bright screening-photovoltaic soliton pairs are possible due to two-photon photorefractive effect.