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Polarization and configuration dependence of beam self-focusing in photorefractive LiNbO3

Abstract : We 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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Submitted on : Tuesday, May 4, 2021 - 4:30:38 PM
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J. Safioui, M. Chauvet, F. Devaux, V. Coda, F. Pettazzi, et al.. Polarization and configuration dependence of beam self-focusing in photorefractive LiNbO3. Journal of the Optical Society of America B, Optical Society of America, 2009, 26 (3), pp.487-492. ⟨10.1364/JOSAB.26.000487⟩. ⟨hal-00441844⟩



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