中国物理B ›› 2002, Vol. 11 ›› Issue (12): 1276-1279.doi: 10.1088/1009-1963/11/12/311

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Carrier shock and frequency conversion of a few-cycle pulse laser propagating in a non-resonant two-level atom medium

肖健, 王中阳, 徐至展   

  1. Laboratory for High Intensity Optics, Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai 201800, China
  • 收稿日期:2002-06-26 出版日期:2002-12-12 发布日期:2005-06-12
  • 基金资助:
    Project supported by the National Key Basic Research Special Foundation (NKBRSF) (Grant No G1999075200) and the Shanghai Natural Science Foundation (Grant No 00QA14028).

Carrier shock and frequency conversion of a few-cycle pulse laser propagating in a non-resonant two-level atom medium

Xiao Jian(肖健), Wang Zhong-Yang (王中阳), Xu Zhi-Zhan (徐至展)   

  1. Laboratory for High Intensity Optics, Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai 201800, China
  • Received:2002-06-26 Online:2002-12-12 Published:2005-06-12
  • Supported by:
    Project supported by the National Key Basic Research Special Foundation (NKBRSF) (Grant No G1999075200) and the Shanghai Natural Science Foundation (Grant No 00QA14028).

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摘要： We have studied the spectral behaviour of few-cycle soliton pulses in a non-resonant two-level atom medium by solving the full Maxwell－Bloch equations. It is demonstrated further that the carrier effects play an important role in the propagation of the few-cycle pulse laser. When the frequency detuning is not very large, both the population distribution and the refractive index of the medium follow the oscillatory carrier field instantaneously; in this case, carrier-wave compression or carrier shock occurs, and a supercontinuum broader than that in the resonant medium may be generated. When the frequency detuning is large, the carrier shock is weak and the spectrum is not continuous, only showing an odd harmonic radiation.

关键词: supercontinuum, self-phase modulation, population distribution, carrier shock

Abstract: We have studied the spectral behaviour of few-cycle soliton pulses in a non-resonant two-level atom medium by solving the full Maxwell－Bloch equations. It is demonstrated further that the carrier effects play an important role in the propagation of the few-cycle pulse laser. When the frequency detuning is not very large, both the population distribution and the refractive index of the medium follow the oscillatory carrier field instantaneously; in this case, carrier-wave compression or carrier shock occurs, and a supercontinuum broader than that in the resonant medium may be generated. When the frequency detuning is large, the carrier shock is weak and the spectrum is not continuous, only showing an odd harmonic radiation.

Key words: supercontinuum, self-phase modulation, population distribution, carrier shock

中图分类号:  (Beam trapping, self-focusing and defocusing; self-phase modulation)

  • 42.65.Jx
42.65.Tg (Optical solitons; nonlinear guided waves) 42.65.Ky (Frequency conversion; harmonic generation, including higher-order harmonic generation) 42.60.Fc (Modulation, tuning, and mode locking)