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1
Content available A method for probing the refractive index change in photorefractive crystals
Fu M., Gao C., Wang X., Cui Y., Dai S
Optica Applicata
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2013
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Vol. 43, nr 4
731--737
EN
A method for probing refractive index changes in photorefractive crystals using an interferometric technique and digital image processing was proposed. Based on equal thickness interference in LiNbO3 crystal and Fourier transform profilometry, we obtained phase value changes in interferograms induced by a photorefractive effect, and further calculated refractive index changes. The maximal values for extraordinary light (e-light) and ordinary light (o-light) are 6.6×10–4 and 1.2×10–4, respectively.
2
Content available remote Investigation of nonlinearity of photorefractive effect in LiNbO3
Turek I., Tarjanyi N.
Optica Applicata
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2009
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Vol. 39, nr 3
587-599
EN
In this paper, the nonlinearities resulting from the simple band transport model of photorefractivity are compared with dependences experimentally obtained in LiNbO3:Fe crystals. The investigation of nonlinearities is performed for both periodic and aperiodic optical fields. The comparison shows that the space-charge field cannot be the main cause of light-induced refractive index changes.
3
Content available remote Spatial solitons in biased photorefractive media with quadratic electro-optic effect
Ziółkowski A., Weinert-Rączka E.
Opto-Electronics Review
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2005
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Vol. 13, No. 2
135-140
EN
Propagation of optical beams and properties of one-dimensional (1D) spatial solitons in biased photorefractive media with quadratic electro-optic effect are analysed. An exact analytic solution of the corresponding propagation problem is presented as well as a numerical investigation of the evolution of optical beams.
4
Content available remote Discrete diffraction in an optically induced lattice in photorefractive media with a quadratic electro-optic effect
Staroń G., Weinert-Rączka E., Urban P.
Opto-Electronics Review
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2005
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Vol. 13, No. 2
93-102
EN
Propagation of light in an optically induced waveguide array in biased photorefractive media with a quadratic electro-optic effect is investigated numerically with the beam propagation method. The refractive index distribution of the array is induced by two coherent plane waves interfering in a guiding layer in a photorefractive multiple quantum well (MQW) planar waveguide. The influence of modulation depth and the space period of an interference pattern as well as the external electric field intensity on diffraction properties of the array is analysed. The potential possibility of all-optical switching due to the dependence of the guided wave output distribution on the external waves parameters is shown.
5
Content available remote Photorefractive materials and solitions
Królikowski W., Kivshar Y., Luther-Davies B.
Opto-Electronics Review
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2001
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Vol. 9, No. 3
287-292
EN
We investigated the formation and interaction of bright spatial solitons in photorefractive nonlinear media. We demonstrate solition formation, self-bending, coherent and incoherent collision resulting in energy exchange, solition fusion, birth of new solitions and anomalous repulsion of solitions. The results on formation of multi-comporient incoherent solitions (vector solitions) are also presented.
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