Large Nonlinear Phase Modulation in Quasi-Phase-Matched KTP Waveguides as aResult of Cascaded Second-Order Processes

摘要

Nonlinear spectral modulation and broadening have been observed in quasi-phase-matched KTP waveguides near 850 nm, indicative of self-phase modulation that is due to cascaded second-order processes. Numerical beam-propagation simulations indicate nonlinear peak phase shifts larger than pi for 600 W of peak power in a 2.8-mm-long guide.