Temporal behavior of low-amplitude dark spatial solitons in two-photon centrosymmetric photorefractive media |
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| Authors: | Xuanmang Ji Jihuan Yao Qichang Jiang Jinsong Liu |
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| Affiliation: | 1. Department of Physics and Electronic Engineering, Yuncheng University, Yuncheng, 044000, China;2. College of Optoelectronic Science and Engineering, Huazhong University of Science and Technology, Wuhan, 430074, China) |
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| Abstract: | We investigate the temporal behavior of low-amplitude dark spatial solitons in biased centrosymmetric crystals with two-photon photorefractive effects. The expressions of time-dependent space-charge field and dynamical evolution equation are derived. The temporal behaviors of the intensity profiles and the intensity full width at half maximum (FWHM) of dark solitons are investigated by numerical method. The results indicate that a broad soliton is generated at the beginning, and as time evolves, the intensity width of solitons decrease monotonously to a minimum value toward steady state. Within the same propagation time, the higher the ratio of soliton peak intensity to the dark irradiation intensity is, the shorter the FWHM of dark solitons is. |
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| Keywords: | Nonlinear optics Centrosymmetric photorefractive material Two-photon photorefractive effect Temporal behavior |
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