We investigate nonlinear focusing behavior of light beams propagating in beta-barium-borate 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).
© 2014 Optical Society of America
Original Manuscript: November 8, 2013
Revised Manuscript: January 8, 2014
Manuscript Accepted: January 9, 2014
Published: February 10, 2014
K. Krupa, F. Baronio, M. Conforti, S. Trillo, A. Tonello, and V. Couderc, "Zero focusing via competing nonlinearities in beta-barium-borate crystals," Opt. Lett. 39, 925-928 (2014)