| Carrier shock and frequency conversion of a few—cycle pulse laser propagating in a non—resonant two—level atom medium |
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| 引用本文： | 肖健,王中阳,徐至展.Carrier shock and frequency conversion of a few—cycle pulse laser propagating in a non—resonant two—level atom medium[J].中国物理 B,2002,11(12):1276-1279. |
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| 作者姓名： | 肖健 王中阳 徐至展 |
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| 作者单位： | Laboratory for High Intensity Optics, Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai 201800, China;Laboratory for High Intensity Optics, Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai 201800, China;Laboratory for High Intensity Optics, Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai 201800, China |
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| 基金项目： | 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.
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| 关 键 词： | 脉冲激光 双能级原子介质 非线性效应 自相位调制 |
| 收稿时间： | 2002-06-26 |
Carrier shock and frequency conversion of a few-cycle pulse laser propagating in a non-resonant two-level atom medium |
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| Xiao Jian,Wang Zhong-Yang and Xu Zhi-Zhan.Carrier shock and frequency conversion of a few-cycle pulse laser propagating in a non-resonant two-level atom medium[J].Chinese Physics B,2002,11(12):1276-1279. |
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| Authors: | Xiao Jian Wang Zhong-Yang and Xu Zhi-Zhan |
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| Institution: | Laboratory for High Intensity Optics, Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai 201800, China |
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| 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. |
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| Keywords: | supercontinuum self-phase modulation population distribution carrier shock |
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