Abstract
The second harmonic generation process strongly depends on the phase-matching condition of the interacting waves. Very far from perfect phase-matching, the wave coupling at the input interface of the nonlinear material generates two second-harmonic pulses, one propagating at the speed given by its refractive index, and one perfectly locked in time with the pump field, and consequently propagating exactly with the same group and phase velocities.
© 2009 IEEE
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