Solitons in Stimulated Raman Scattering: Generation and Control of Ultrashort Optical Pulses

摘要

The propagation of Raman solitons in media with homogeneous and inhomogeneous broadening is studied. Results are obtained for the amplitude and temporal width of solitons as functions of propagation distance and detuning from exact Raman resonance. The analytical treatment uses differential conservation laws, which give good quantitative estimates as well as a detailed understanding of the balance of physical processes responsible for soliton evolution. Numerical calculations are used to verify the analytical results and to extend them to the transient regime, where the soliton width is comparable to the coherence time of the medium. solitons are found to be more stable for inhomogeneous broadening than for homogeneous broadening. In order to obtain both good pulse narrowing and soliton stability, the detuning from exact Raman resonance should not exceed 5% of the Raman line width. These results make media with broad inhomogeneous Raman lines like optical fibers the most promising candidates for the application of Raman solitons.