self-trapping in the presence of random quasi-phase-matching
C. Conti, E. D'Asaro, S. Stivala, A. C. Busacca and G. Assanto
Opt. Lett. 35 (22), 3760 (2010)
Abstract:We report on experimental evidence of parametric spatial solitons in a quadratic crystal with randomized periodic ferroelectric poling. Two-color self-focusing via quadratic cascading overcomes the diffractive nature of both fundamental and frequency-doubled beams.