Generation and dynamics of quadratic birefringent spatial gap solitons

Abstract : A method is proposed to generate and study the dynamics of spatial light solitons in a birefringent medium with quadratic nonlinearity. Although no analytical expression for propagating solitons has been obtained, our numerical simulations show the existence of stable localized spatial solitons in the frequency forbidden band gap of the medium. The dynamics of these objects is quite rich and manifests for instance elastic reflections, or inelastic collisions where two solitons merge and propagate as a single solitary wave. We derive the dynamics of the slowly varying envelopes of the three fields (second harmonic pump and two-component signal) and study this new system theoretically. We show that it does present a threshold for nonlinear supratransmission that can be calculated from a series expansion approach with a very high accuracy. Specific physical implications of our theoretical predictions are illustrated on LiGaTe2 (LGT) crystals. Once irradiated by a cw laser beam of 10 mu m wavelength, at an incidence beyond the extinction angle, such crystals will transmit light, in the form of spatial solitons generated in the nonlinear regime above the nonlinear supratransmission threshold.
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Article dans une revue
Physical Review A, American Physical Society, 2011, 83, pp.043836. 〈10.1103/PhysRevA.83.043836〉
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https://hal.archives-ouvertes.fr/hal-00628026
Contributeur : L2c Aigle <>
Soumis le : vendredi 30 septembre 2011 - 11:11:40
Dernière modification le : mardi 3 juillet 2018 - 11:21:46

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P. Anghel-Vasilescu, Jerome Dorignac, Frédéric Geniet, Jérome Léon, A. Taki. Generation and dynamics of quadratic birefringent spatial gap solitons. Physical Review A, American Physical Society, 2011, 83, pp.043836. 〈10.1103/PhysRevA.83.043836〉. 〈hal-00628026〉

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