A detailed numerical comparison of the bandwidth–efficiency trade-off for second-harmonic generation (SHG) achieved by the formation of two-dimensional quadratic spatial solitons versus the more conventional method of gentle focusing in the middle of a nonlinear crystal is presented. Numerical simulations for type II SHG in potassium titanyl phosphate with constant wave-vector mismatch show that the 3-dB drop-off in SHG conversion efficiency can be many multiples of π in detuning from the phase-match condition over a large range of walk-off angles and focal positions.
© 1998 Optical Society of America
(140.3300) Lasers and laser optics : Laser beam shaping
(190.0190) Nonlinear optics : Nonlinear optics
(190.2620) Nonlinear optics : Harmonic generation and mixing
(190.5530) Nonlinear optics : Pulse propagation and temporal solitons
M. Ohkawa, R. A. Fuerst, and G. I. Stegeman, "Bandwidth enhancement of second-harmonic generation with quadratic spatial-soliton generation versus conventional methods," J. Opt. Soc. Am. B 15, 2769-2772 (1998)