Raman effect in self-focusing of few-cycle laser pulses in air.

@article{Chen2013RamanEI,
  title={Raman effect in self-focusing of few-cycle laser pulses in air.},
  author={Xi Chen and Pavel G Polynkin and M. Kolesik},
  journal={Optics letters},
  year={2013},
  volume={38 12},
  pages={
          2017-9
        }
}
Self-focusing of ultrashort pulses in air is investigated by means of numerical simulations. The role of the vibrational Raman effect and its dependence on pulse chirp is studied, with results shedding new light on the interpretation of the measurements of the critical self-focusing power. We also discuss computational modeling issues important specifically for few-cycle pulses. 
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