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.
Received: 26 June 2002
Accepted manuscript online:
PACS:
42.65.Jx
(Beam trapping, self-focusing and defocusing; self-phase modulation)
Fund: Project supported by the National Key Basic Research Special Foundation (NKBRSF) (Grant No G1999075200) and the Shanghai Natural Science Foundation (Grant No 00QA14028).
Cite this article:
Xiao Jian (肖健), Wang Zhong-Yang (王中阳), Xu Zhi-Zhan (徐至展) Carrier shock and frequency conversion of a few-cycle pulse laser propagating in a non-resonant two-level atom medium 2002 Chinese Physics 11 1276
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