We show theoretically that the frequency shifts that result from phase-mismatched cascaded processes under conditions of strong group-velocity mismatch can be significantly enhanced by local control of the nonlinearity with propagation. This control is possible with continuous variation of the poling period of quasi-phase-matched structures and can allow one to avoid saturation of the frequency shift. We theoretically demonstrate its applicability to high-quality, efficient frequency shifting of infrared pulses.
© 2004 Optical Society of America
(190.0190) Nonlinear optics : Nonlinear optics
(190.2640) Nonlinear optics : Stimulated scattering, modulation, etc.
(190.5650) Nonlinear optics : Raman effect
(190.7110) Nonlinear optics : Ultrafast nonlinear optics
(230.3990) Optical devices : Micro-optical devices
(320.5540) Ultrafast optics : Pulse shaping
K. Beckwitt, F. Ö. Ilday, and F. W. Wise, "Frequency shifting with local nonlinearity management in nonuniformly poled quadratic nonlinear materials," Opt. Lett. 29, 763-765 (2004)