Real (dashed blue) and imaginary (solid red) parts of the Raman response spectra, R(ω), for LN and silica in the upper and lower plots respectively.

Real (dashed blue) and imaginary (solid red) parts of the Raman response spectra, R(ω), for LN and silica in the upper and lower plots respectively.

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We analyse Raman-induced self-frequency shift in two-component solitons supported by both quadratic and cubic nonlinearities. Treating Raman terms as a perturbation, we derive expressions for soliton velocity and frequency shifts of the fundamental frequency and second harmonic soliton components. We find these predictions compare well with simulat...

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Context 1
... reason some predictions do not match the simulations more closely is largely down to spectral cutoff of the soliton due to the sharp Raman peak in LN [9]. The sharp Raman peaks in LN are clear when compared with silica in figure 1. This has been seen before in solitons in air-core fibres where a significant portion of the initial pulse propagates as non-solitonic radiation [9]. ...

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