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We show that incoherently coupled soliton pairs can exist in photorefractive polymer under steady-state conditions. These soliton pairs can be established provided that their carrier beams have the same polarization, wavelength, a...
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We show that incoherently coupled soliton pairs can exist in photorefractive polymer under steady-state conditions. These soliton pairs can be established provided that their carrier beams have the same polarization, wavelength, and are Mutually incoherent.
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The existence of incoherently coupled two-component steady state photovoltaic solitons in biased two-photon photorefractive materials due to two-photon photorefractive effect has been investigated. In the steady state regime, thes...
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The existence of incoherently coupled two-component steady state photovoltaic solitons in biased two-photon photorefractive materials due to two-photon photorefractive effect has been investigated. In the steady state regime, these incoherently coupled solitons can propagate in brightbright, darkdark and brightdark configurations. The most important finding is that, with the application of electric field, it is possible to generate solitons and control them in those media where soliton formation was hitherto prohibited. Dynamic evolution of these solitons has been examined using numerical simulations, which show that these solitons are stable.
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We provide a theoretical investigation of temperature effects on one-dimensional modulation instability of broad optical beams in photorefractive crystals. Those physical factors related to the temperature effect, i.e., the dielec...
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We provide a theoretical investigation of temperature effects on one-dimensional modulation instability of broad optical beams in photorefractive crystals. Those physical factors related to the temperature effect, i.e., the dielectric constant, diffusion process and the dark irradiance, are considered. Our results show that, for non-centrosymmetric crystals, the dark irradiance dominates the temperature dependence of modulation instability; however, the dielectric constant temperature-dependence dominates the process in centrosymmetric photorefractive crystals. Relevant examples are provided.
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We analyze the existence and stability of gap solitons supported by optical lattices with self-focusing nonlinearity in biased centrosymmetric photorefractive crystals. It is shown that, in first finite bandgap, gap solitons are s...
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We analyze the existence and stability of gap solitons supported by optical lattices with self-focusing nonlinearity in biased centrosymmetric photorefractive crystals. It is shown that, in first finite bandgap, gap solitons are symmetric in transverse dimension, single humped, entirely positive and linearly stable, while these solitons are antisymmetric with similar profiles, the stable and unstable intervals of the gap solitons are intertwined in the second finite bandgap.
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We investigate theoretically the time behavior of spatial solitons in biased centrosymmetric photorefractive crystals. A one-dimensional time-dependent wave propagation equation in biased centrosymmetric photorefractive crystals i...
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We investigate theoretically the time behavior of spatial solitons in biased centrosymmetric photorefractive crystals. A one-dimensional time-dependent wave propagation equation in biased centrosymmetric photorefractive crystals is presented. It is shown that the bright solitons exist in both quasi-steady-state and steady-state regimes for high saturation values. When the intensity ratio is smaller than unity, the bright soliton width decreases monotonically to a minimum value toward steady state. Moreover, the time-dependent nonlinear wave equation exhibits only steady-state screening dark spatial solitons.
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We present the evolution equation of one-dimensional spatial solitons in centrosymmetric photorefractive media due to the two-photon photorefractive effect. It is shown theoretically that both dark and bright spatial solitons can ...
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We present the evolution equation of one-dimensional spatial solitons in centrosymmetric photorefractive media due to the two-photon photorefractive effect. It is shown theoretically that both dark and bright spatial solitons can exist in two-photon centrosymmetric photorefractive media under steady-state conditions. Moreover, we also investigate the self-deflection of steady-state bright solitons arising from the diffusion effects.
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It is shown theoretically that incoherently coupled dark, bright and bright–dark hybrid soliton families can exist in centrosymmetric two-photon photorefractive crystals under steady-state conditions. These soliton families can b...
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It is shown theoretically that incoherently coupled dark, bright and bright–dark hybrid soliton families can exist in centrosymmetric two-photon photorefractive crystals under steady-state conditions. These soliton families can be established provided that the incident optical beams share the same polarization and frequency, and are mutually incoherent.
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We present the evolution equation of one-dimensional spatial soliton in two-photon photorefractive media under open-circuit conditions. In the steady state regime, our solutions show that the dark and bright photovoltaic spatial s...
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We present the evolution equation of one-dimensional spatial soliton in two-photon photorefractive media under open-circuit conditions. In the steady state regime, our solutions show that the dark and bright photovoltaic spatial solitons can be supported in two-photon photorefractive media under open-circuit conditions.
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We study the one-dimensional modulational instability of incoherently coupled beams in biased photorefractive crystals under steady-state conditions. By globally treating the space-charge equation and only considering the local sp...
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We study the one-dimensional modulational instability of incoherently coupled beams in biased photorefractive crystals under steady-state conditions. By globally treating the space-charge equation and only considering the local space-charge effect, i.e., neglecting the higher-order terms in the space-charge equation, we obtain the global and local one-dimensional modulational instability growth rates of incoherently coupled beams in biased photorefractive crystals. Our results show that both the modulational instability growth rates can be adjusted and controlled by external bias field and the intensities of background beam and incoherently coupled signal beams.
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The effects of diffusion on self-deflection of steady-state bright spatial solitons in biased centrosymmetric photorefractive crystals are investigated systematically by both numerical and perturbation methods. The results show th...
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The effects of diffusion on self-deflection of steady-state bright spatial solitons in biased centrosymmetric photorefractive crystals are investigated systematically by both numerical and perturbation methods. The results show that the soliton propagates along a parabolic trajectory and the central spatial frequency component shifts linearly with the propagation distance. Both the deflection effects vary cubically with applied external bias field.
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