加外电场的光伏光折变晶体中的空间孤子波

PHOTOREFRACTIVE CRYSTALS

证明了在加外电场的光伏光折变晶体中存在着明、暗稳态空间孤子波．它源于对外电场的非均匀空间屏蔽和光伏效应．同已报道的稳态光折变空间孤子相比，它具有不同的特性和物理根源．当外电场足够强时，它类似于屏蔽孤子；当外电场为零时，它退化成闭路条件下的光伏孤子．

AbstractSteadystate dark (bright)spatial solitons are predicted for biased photovoltaic photorefractive materials,which are due to the photovoltaic effect and spatially nonuniform screening of the external bias field. These solitons differ from previously observed steadystate photorefractive spatial solitons in their properties and physical origin.If the applied field is strong enough, these solitons are just like the screening solitons. If the applied field is absent, these solitons degenerate into the photovoltaic solitons under the closecircuit condition.