A self-focusing is observed that arises from a purely second-order nonlinear susceptibility in a phase-matched second-harmonic-generation experiment. Control of the magnitude and sign of the intensity-dependent phase shift is accomplished through a dispersion external to the nonlinear medium. Analytical expressions characterizing the self-focusing and chirp on both beams in the two-wave parametric interaction are presented and compared with experimental values.
© 1993 Optical Society of America
Diego Pierrottet, Brian Berman, Matteo Vannini, and Dan McGraw, "Parametric lens," Opt. Lett. 18, 263-265 (1993)