Exact cascading nonlinearity in quasi-phase-matched quadratic media
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...
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| Published in | Optics letters Vol. 39; no. 8; p. 2427 |
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| Main Author | |
| Format | Journal Article |
| Language | English |
| Published |
United States
15.04.2014
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| Online Access | Get more information |
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| Summary: | 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. |
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| ISSN: | 1539-4794 |
| DOI: | 10.1364/OL.39.002427 |