The theory of the screening-photovoltaic solitons is improved in biased photorefractive-photovoltaic crystals.When the photovoltaic effect is negligible,the screening-photovoltaic solitons are the screening ones,and t...The theory of the screening-photovoltaic solitons is improved in biased photorefractive-photovoltaic crystals.When the photovoltaic effect is negligible,the screening-photovoltaic solitons are the screening ones,and their space-charge field is the space-charge field of the screening solitons.If the external field is absent,the screening-photovoltaic solitons are the photovoltaic ones on the open-and closed-circuit conditions,and their space-charge field is of the photovoltaic solitons.We also show theoretically that the screening and the photovoltaic solitons on the open-and closed-circuit conditions may be studies together as the screening-photovoltaic solitons.展开更多
The effect of fourth-order coherence on ultrafast modulation spectroscopy(UMS)with phase-conjugation geome-try(PCUMS)in a cascade three-level system is investigated using chaotic and phase-diffusion models.It has been...The effect of fourth-order coherence on ultrafast modulation spectroscopy(UMS)with phase-conjugation geome-try(PCUMS)in a cascade three-level system is investigated using chaotic and phase-diffusion models.It has been found that the modulation terms of the beat signal depend on.the second-order coherence function,and different stochastic models of the laser field affect only the fourth-order coherence function.The difference between the PCUMS and UMS is discussed from a physical viewpoint.展开更多
The intensity response of an optically erased photorefractive two-wave mixing to the erase beam is studied by using the coupling wave equation and the band-transport model.The concepts of response strength and the min...The intensity response of an optically erased photorefractive two-wave mixing to the erase beam is studied by using the coupling wave equation and the band-transport model.The concepts of response strength and the minimum response intensity are introduced and their temperature dependence is investigated.A 2-fold increase in the response strength and 4-fold decrease in minimum response intensity have been experimentally observed in Ce:KNSBN at 633 nm when the crystal temperature is raised from 320 to 370K.These experimental results are in agreement with theoretical analysis and show that the response property can be improved by changing the crystal temperature.展开更多
基金Supported by the Chinese National Nature Sciences Foundation(Grant No.69978019)the State Key Laboratory Foundation of Transient Optics Technology(Grant No.YAK20006)。
文摘The theory of the screening-photovoltaic solitons is improved in biased photorefractive-photovoltaic crystals.When the photovoltaic effect is negligible,the screening-photovoltaic solitons are the screening ones,and their space-charge field is the space-charge field of the screening solitons.If the external field is absent,the screening-photovoltaic solitons are the photovoltaic ones on the open-and closed-circuit conditions,and their space-charge field is of the photovoltaic solitons.We also show theoretically that the screening and the photovoltaic solitons on the open-and closed-circuit conditions may be studies together as the screening-photovoltaic solitons.
基金Supported by the National Natural Science Foundation of China under Grant No.69978019.
文摘The effect of fourth-order coherence on ultrafast modulation spectroscopy(UMS)with phase-conjugation geome-try(PCUMS)in a cascade three-level system is investigated using chaotic and phase-diffusion models.It has been found that the modulation terms of the beat signal depend on.the second-order coherence function,and different stochastic models of the laser field affect only the fourth-order coherence function.The difference between the PCUMS and UMS is discussed from a physical viewpoint.
文摘The intensity response of an optically erased photorefractive two-wave mixing to the erase beam is studied by using the coupling wave equation and the band-transport model.The concepts of response strength and the minimum response intensity are introduced and their temperature dependence is investigated.A 2-fold increase in the response strength and 4-fold decrease in minimum response intensity have been experimentally observed in Ce:KNSBN at 633 nm when the crystal temperature is raised from 320 to 370K.These experimental results are in agreement with theoretical analysis and show that the response property can be improved by changing the crystal temperature.
