Preprint article ยท Journal article
Modulational instability in periodic quadratic nonlinear materials
We investigate the modulational instability of plane waves in quadratic nonlinear materials with linear and nonlinear quasi-phase-matching gratings. Exact Floquet calculations, confirmed by numerical simulations, show that the periodicity can drastically alter the gain spectrum but never completely removes the instability.
The low-frequency part of the gain spectrum is accurately predicted by an averaged theory and disappears for certain gratings. The high-frequency part is related to the inherent gain of the homogeneous non-phase-matched material and is a consistent spectral feature.
Language: | English |
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Year: | 2001 |
Pages: | 133901 |
ISSN: | 10797114 and 00319007 |
Types: | Preprint article and Journal article |
DOI: | 10.1103/PhysRevLett.87.133901 |
ORCIDs: | Bang, Ole |