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Incoherent interaction between one- and two-dimensional solitons in noncentrosymmetric photorefractive media

Xiao Fa-Jun,Zhang Peng,Liu Sheng,Gan Xue-Tao,Zhao Jian-Lin,

中国物理 B , 2010,
Abstract: The incoherent interaction between solitons with different transverse dimensions in a noncentrosymmetric photorefractive crystal is studied both in theory and in experiment. An anomalous incoherent interaction between one- and two-dimensional solitons, whose attractive and repulsive effects depend on the soliton separation, is numerically demonstrated by employing an anisotropic model. By launching a one-dimensional green beam and a two-dimensional red beam into a biased SBN:60 crystal, the hybrid-dimensional soliton interaction is performed. The experimental results are in good agreement with the numerical ones.
Self-trapped bidirectional waveguides in a saturable photorefractive medium  [PDF]
M. Belic,Ph. Jander,A. Strinic,A. Desyatnikov,C. Denz
Physics , 2003, DOI: 10.1103/PhysRevE.68.025601
Abstract: We introduce a time-dependent model for the generation of joint solitary waveguides by counter-propagating light beams in a photorefractive crystal. Depending on initial conditions, beams form stable steady-state structures or display periodic and irregular temporal dynamics. The steady-state solutions are non-uniform in the direction of propagation and represent a general class of self-trapped waveguides, including counterpropagating spatial vector solitons as a particular case.
Influence of external electric field on photorefractive two-wave coupling in SBN:Cr crystal and its applications

物理学报 , 2004,
Abstract: The properties and applications of the photorefractive two-wave coupling in congruent SBN:Cr(Sr 0.61Ba 0.39Nb 2O 6:Cr)crystal under external dc electric field are experimentally investigated in this paper.The variation of the intensity gain coefficient of the two-wave coupling with the external field is analyzed,and the measurement results are presented.It is found that the photorefractive two-wave coupling gain and response rapidity can be both increased,by applying appropriate external electric field to the crystal.Further study indicates this electric response property of SBN:Cr crystal is useful to some applications,such as improving the image edge-enhancement and the image edge-enhancement joint-transform correlator based on the nonlinear energy transfer of photorefractive two-wave coupling in the crystal.
Small amplitude travelling wave solitons in biased photorefractive crystal

Chen Shou-Man,Shi Shun-Xiang,Dong Hong-Zhou,

物理学报 , 2006,
Abstract: The positive and negative travelling wave solitons are predicted in photorefractive crystal biased by positive electric field in the low intensity regime. The amplitude and width of these solitons do not vary, showing the bright soliton properties, whereas the propagation properties of these solitons differ from previously observed steady-state photorefractive spatial solitons. These travelling wave solitons move on a straight line trajectory. The deflecting angle can be controlled by adjusting the parameter of the system.
Gap solitons supported by optical lattices in photorefractive crystals with asymmetric nonlocality  [PDF]
Zhiyong Xu,Yaroslav V. Kartashov,Lluis Torner
Physics , 2006, DOI: 10.1364/OL.31.002027
Abstract: We address the impact of asymmetric nonlocal diffusion nonlinearity on the properties of gap solitons supported by photorefractive crystal with an imprinted optical lattice. We reveal how the asymmetric nonlocal response alters the domains of existence and the stability of solitons originating from different gaps. We find that in such media gap solitons cease to exist above a threshold of the nonlocality degree. We discuss how the interplay between nonlocality and lattice strength modifies the gap soliton mobility.
A hybrid soliton-based system: generation and steering of cavity solitons by means of photorefractive soliton electro-activation  [PDF]
Lorenzo Columbo,Carlo Rizza,Massimo Brambilla,Franco Prati,Giovanna Tissoni
Physics , 2012,
Abstract: We propose a hybrid soliton-based system consisting of a centrosymmetric photorefractive crystal, supporting photorefractive solitons, coupled to a vertical cavity surface emitting laser, supporting multistable cavity solitons. The composite nature of the system, which couples a propagative/conservative field dynamics to a stationary/dissipative one, allows to observe a more general and unified system phenomenology and to conceive novel photonic functionalities. The potential of the proposed hybrid system becomes clear when investigating the generation and control of cavity solitons by propagating a plane wave through electro-activated solitonic waveguides in the crystal. By changing the electro-activation voltage of the crystal, we prove that cavity solitons can be turned on and shifted with controlled velocity across the device section. The scheme can be exploited for applications to optical information encoding and processing.
Existence of dark solitons in a class of stationary nonlinear Schr?dinger equations with periodically modulated nonlinearity and periodic asymptotic  [PDF]
J. Belmonte-Beitia,J. Cuevas
Physics , 2011, DOI: 10.1063/1.3559118
Abstract: In this paper, we give a proof of the existence of stationary dark soliton solutions or heteroclinic orbits of nonlinear equations of Schr\"odinger type with periodic inhomogeneous nonlinearity. The result is illustrated with examples of dark solitons for cubic and photorefractive nonlinearities.
Some Aspects of Optical Spatial Solitons in Photorefractive Crystals  [PDF]
S. Konar,Anjan Biswas
Physics , 2012,
Abstract: We have reviewed recent developments of some aspects of optical spatial solitons in photorefractive media. Underlying principles governing the dynamics of photorefractive nonlinearity have been discussed using band transport model. Nonlinear dynamical equations for propagating solitons have been derived considering single as well as two-photon photorefractive processes. Fundamental properties of three types of solitons, particularly, screening, photovoltaic and screening photovoltaic solitons have been considered. For each type of solitons, three different configurations i.e., bright, dark and gray varieties have been considered. Mechanisms of formation of these solitons due to single as well as two-photon photorefractive processes have been considered and their self bending discussed. Vector solitons, particularly, incoherently coupled solitons due to single photon and two-photon photorefractive phenomena have been highlighted. Existence of some missing solitons have been also pointed out.
General properties and analytical approximations of photorefractive solitons  [PDF]
A. Geisler,F. Homann,H. -J. Schmidt
Physics , 2003, DOI: 10.1016/j.optcom.2004.04.054
Abstract: We investigate general properties of spatial 1-dimensional bright photorefractive solitons and suggest various analytical approximations for the soliton profile and the half width, both depending on an intensity parameter r.
Top- and side-view method for measuring photorefractive spatial optical solitons

Wang Cheng,Liu Jin-Song,Zhang Guang-Yong,Liu Shi-Xiong,Zhang Hui-Lan,

物理学报 , 2007,
Abstract: Basing on CCD technology and software processing, a new method, namely top- and side-view method, is presented for the observation of spatial optical solitons in photorefractive crystals. When a laser beam is propagating in a crystal, this method has an ability to show the horizontal and vertical outline of the beam at any location of the crystal very intuitively. By use of this method, we have experimentally observed the two-dimension bright photovoltaic solitons in a KNSBN crystal, and the measured results are qualitatively in agreement with the results of numerical simulation.
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