Solitonlike Beam Propagation along Light-Induced Singularity of Space Charge in Fast Photorefractive Media

Calvo, Gabriel F.; Sturman, B.; Agulló‐López, F.; Carrascosa, M.

doi:10.1103/physrevlett.89.033902

Cited by 15 publications

(7 citation statements)

References 21 publications

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“…Equation (1) has shown a number of applications in plasma physics [16] and nonlinear optics [17,18,19], specifically in photorefractive media. Photorefractive materials manifest a wealth of nonlinear phenomena which include the propagation of solitons [20,21,22,23,24], surface waves [26] and slow light [25], pattern formation [27], charge singularities [28], and critical enhancement [29]. The case with α = 1 (which corresponds to non-centrosymmetric photorefractive media) has been throughly studied, and solitary wave solutions in the form of bright, black and grey solitons have been found numerically [20,21,22,30].…”

Section: Introductionmentioning

confidence: 99%

Exact bright and dark spatial soliton solutions in saturable nonlinear media

Calvo

Belmonte-Beitia

Pérez-Garcı́a

2009

Chaos, Solitons & Fractals

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Section: Introductionmentioning

confidence: 99%

Exact bright and dark spatial soliton solutions in saturable nonlinear media

Calvo

Belmonte-Beitia

Pérez-Garcı́a

2009

Chaos, Solitons & Fractals

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“…Since the first observation of optical spatial solitons by Kerr in the late 1980s [1], spatial solitons have been studied in various nonlinear media [2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20][21]. These self-trapped beams that propagate without alteration of their transverse profiles have been observed, for instance, in quadratic media [13] and also at very low power intensity in liquid crystals [7,14,15] or photorefractive media [2][3][4]6,[10][11][12]16], with recent studies devoted to propagation in periodic nonlinear media [5,17]. Optical nonlinear effects are essentially light polarization sensitive, which inspires vectorial analysis.…”

Section: Introductionmentioning

confidence: 99%

Polarization and configuration dependence of beam self-focusing in photorefractive LiNbO_3

et al. 2009

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International audienceWe present numerical and experimental analyses showing the formation of (2+1D) spatial photorefractive solitons at visible wavelengths in electrically biased lithium niobate crystals for ordinary and extraordinary light polarizations. Similarly sized self-trapped beams are observed for both polarizations, despite the polarizationdependent electro-optic coefficients. The tensorial character of the photovoltaic effect is shown to play a key role. The soliton-induced waveguides are able to properly guide telecommunication wavelengths. Finally, a higher degree of anisotropy is observed for ordinary polarized solitons for specific electro-optic configurations, which reveals the presence of the photorefractive field component perpendicular to the applied field. Experimental results are confirmed by a time-dependent numerical model

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“…The transfer of energy from one beam to another during the recording process of a holographic grating (two-beam coupling) is regarded as an unambiguous test of photorefractivity [15]. In the soliton regime of beam propagation, a strong interaction among self-trapped light filaments has been predicted to occur in photorefractive silenites under fast alternating electric fields [16]. There, the development of light-induced abrupt refractive index changes was the key feature for strong beam energy exchange.…”

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confidence: 99%

Experimental Detection of the Optical Pendellösung Effect

et al. 2006

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We report observations of periodic oscillatory behavior of the angular selectivity, near the Bragg angle, in volume holographic gratings recorded in a new photopolymerizable glass with high refractive index modulation. We have detected the presence of overmodulation in the intensity distribution of the first diffraction order. The results reported here were achieved by incorporating in the photopolymerizable solgel glass zirconium-based high refractive index species at the molecular level. This is the first time that this effect is observed for light diffraction in an amorphous material. Introduction.-The Pendellösung effect was first observed by Shull in 1968 for the interference formed by the diffraction of slow neutron beams by thick perfect crystals of silicon with a thickness ranging from 0.33 to 1 cm [1]. The oscillatory behavior of the diffracted intensity was caused by the coherent transfer of neutron flux between the transmitted and internally Bragg-reflected beams by the periodic crystalline structure producing amplitude overmodulation. The Laue diffraction formalism provides the theoretical explanation of this phenomenon [2].The Pendellösung fringe structure appears as a consequence of the interference between two branches of the wave function that result as solutions of the wave (Schrödinger) equation within the framework of the dynamical theory of diffraction. This phenomenon is formally analogous to the transfer of energy between two coupled pendulums, hence its name. One actual application of this effect was the experimental determination of the unit cell of the crystal structure and the scattering amplitude. The defects in the crystal structures (e.g., lattice dislocations) can hinder observation of the Pendellösung phenomenon since the presence of such defects can disturb the interference and the resulting energy transfer process. Similar experiments were later carried out on crystals other than silicon (e.g., Ge, FeBO 3 , and Fe 2 O 3 ) and polarized neutron beams [3]. The Pendellösung effect has also been predicted and observed in second-order Bragg scattering of matter waves from a standing light wave acting as a thick grating [4]. Further experiments showed that a quasiPendellösung effect can be observed in the Raman-Nath regime for diffraction of atomic beams from standing light waves [5].The dynamical theory of x-ray diffraction formulated by Ewald [6] accounts for the Pendellösung effect. The coherent splitting of the incident beam will result in radiation periodically beating at different depths of the grating. The experimental observation of this effect is not trivial since it requires thick almost perfect crystal structures, or amor-

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Solitonlike Beam Propagation along Light-Induced Singularity of Space Charge in Fast Photorefractive Media

Cited by 15 publications

References 21 publications

Exact bright and dark spatial soliton solutions in saturable nonlinear media

Exact bright and dark spatial soliton solutions in saturable nonlinear media

Polarization and configuration dependence of beam self-focusing in photorefractive LiNbO_3

Experimental Detection of the Optical Pendellösung Effect

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