期刊
OPTICS LETTERS
卷 39, 期 8, 页码 2427-2430出版社
OPTICAL SOC AMER
DOI: 10.1364/OL.39.002427
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资金
- MIUR [PRIN 2009P3K72Z, PRIN 2012BFNWZ2]
- ANR (grant TOPWAVE)
The evolution of light pulses and beams in a quasi-phase-matched (QPM) quadratic medium is usually described by considering only the spatial harmonic of the QPM grating that minimizes the residual phase-mismatch. I show that, for strongly phase-mismatched interactions (the cascading regime), several harmonics need to be accounted for in order to obtain the correct value of the effective cubic nonlinearity, for which I find a simple analytical expression. I discuss the effects of the higher order harmonics of the grating on solitary wave propagation. (C) 2014 Optical Society of America
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