The impact of the loss on the evolution of screening-photovoltaic spatial solitons

The impact of linear loss on the evolution of screening-photovoltaic (SP) s patial solitons in biased photovoltaic-photorefractive crystals is investig ated. Our numerical study indicates that the loss not only results in the d ecrease of the amplitude of the soliton beam,but also results in the change of the shape of the soliton beam. For the bright SP soliton,the soliton wi dth increases as the propagation distance increases for the SP soliton with low-intensity at the input,whereas the soliton width decreases initially a nd then increases as the propagation distance increases, and there is a pro pagation distance in which the soliton width returns to its value at the in put for the SP soliton with high-intensity at the input. For the dark SP so liton,the soliton width increases as the propagation distance increases whe ther the SP soliton has low- or high-intensity at the input. Though the eff ect of loss on the evolution of SP soliton can be ignored if the propagatio n distance is shea enough,the loss is eventually expected to destroy these solitons at long distance.