Abstract
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
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