Zero focusing via competing nonlinearities in beta-barium-borate crystals

K. Krupa (1) , F. Baronio (2) , Matteo Conforti (2) , Stefano Trillo (3) , A. Tonello (4) , V. Couderc (4)

1 XLIM - XLIM
2 Dipartimento di Ingegneria dell'Informazione [Brescia]
3 Engineering Department [Ferrara]
4 XLIM-PHOT - Photonique Fibre et Sources Cohérentes

We investigate nonlinear focusing behavior of light beams propagating in beta-barium-borate (BBO) crystals under mismatched second-harmonic generation. We clearly identify experimentally multiple self-focusing and defocusing regions against the orientation angle, and the condition where competing quadratic and cubic nonlinearities perfectly compensate each other (zero-focusing point).

Mots clés: Kerr effect, Harmonic generation and mixing, Nonlinear wave mixing, Kerr effect.

Domaines: Optique [physics.optics]

K. Krupa, F. Baronio, Matteo Conforti, Stefano Trillo, A. Tonello, et al.. Zero focusing via competing nonlinearities in beta-barium-borate crystals. Optics Letters, 2014, 39 (4), pp.925-928. ⟨10.1364/OL.39.000925⟩. ⟨hal-02389299⟩