Photorefractive screening solitons of high and low intensity

摘要: We analyze self-trapping of optical beams in photorefractive media for low irradiances that are typical cw lasers and high short-pulse obtain bright dark soliton solutions one transverse dimension. Whereas the low-intensity regime screening solitons trapped by refractive-index change is related to electric field associated with ionized donors or acceptors, high-intensity index also free carriers. Since time necessary form scales inversely intensity, expects a very fast response regime, this suggests attractive applications switching reconfigurable waveguides. show throughout entire intensity range require lower voltages less energy per pulse than do solitons.