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- W2045491344 abstract "Modulational instability in optical Bragg gratings with a quadratic nonlinearity is studied. The electric field in such structures consists of forward and backward propagating components at the fundamental frequency and its second harmonic. Analytic continuous wave (CW) solutions are obtained, and the intricate complexity of their stability, due to the large number of equations and number of free parameters, is revealed. The stability boundaries are rich in structures and often cannot be described by a simple relationship. In most cases, the CW solutions are unstable. However, stable regions are found in the nonlinear Schrödinger equation limit, and also when the grating strength for the second harmonic is stronger than that of the first harmonic. Stable CW solutions usually require a low intensity. The analysis is confirmed by directly simulating the governing equations. The stable regions found have possible applications in second-harmonic generation and dark solitons, while the unstable regions may be useful in the generation of ultrafast pulse trains at relatively low intensities." @default.
- W2045491344 created "2016-06-24" @default.
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- W2045491344 date "1999-05-01" @default.
- W2045491344 modified "2023-10-02" @default.
- W2045491344 title "Theory of modulational instability in Bragg gratings with quadratic nonlinearity" @default.
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- W2045491344 doi "https://doi.org/10.1103/physreve.59.6064" @default.
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