中国物理B ›› 2001, Vol. 10 ›› Issue (10): 941-945.doi: 10.1088/1009-1963/10/10/311

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SPECTRUM OF A FEW-CYCLE LASER PULSE PROPAGATING IN A 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:2001-03-26 修回日期:2001-05-26 出版日期:2001-10-15 发布日期:2005-06-12
  • 基金资助:
    Project supported by the National Key Basic Research Special Foundation of China (NKBRSFC) (Grant No. G1999075200) and by the Natural Science Foundation of Shanghai, China (Grant No. 00QA14028).

SPECTRUM OF A FEW-CYCLE LASER PULSE PROPAGATING IN A TWO-LEVEL ATOM MEDIUM

Xiao Jian, 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:2001-03-26 Revised:2001-05-26 Online:2001-10-15 Published:2005-06-12
  • Supported by:
    Project supported by the National Key Basic Research Special Foundation of China (NKBRSFC) (Grant No. G1999075200) and by the Natural Science Foundation of Shanghai, China (Grant No. 00QA14028).

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摘要： The spectrum evolution of a few-cycle optical pulse in a resonant two-level atom medium is studied theoretically by using the full Maxwell--Bloch equations. On the propagating pulse, significantly much faster oscillation components separated with the main pulse appear due to strong self-phase modulation and pulse reshaping. In this case, ideal self-induced transparency cannot occur for a 2π pulse. The spectrum of the 4π pulse shows an evident oscillatory feature because of the continuum interference of the separate pulses. For larger pulse areas, continuum generation from near ultraviolet to infrared occurs.

Abstract: The spectrum evolution of a few-cycle optical pulse in a resonant two-level atom medium is studied theoretically by using the full Maxwell--Bloch equations. On the propagating pulse, significantly much faster oscillation components separated with the main pulse appear due to strong self-phase modulation and pulse reshaping. In this case, ideal self-induced transparency cannot occur for a 2$\pi$ pulse. The spectrum of the 4$\pi$ pulse shows an evident oscillatory feature because of the continuum interference of the separate pulses. For larger pulse areas, continuum generation from near ultraviolet to infrared occurs.

Key words: supercontinuum, self-phase modulation, self-induced transparency

中图分类号:  (Beam characteristics: profile, intensity, and power; spatial pattern formation)

  • 42.60.Jf
42.65.Jx (Beam trapping, self-focusing and defocusing; self-phase modulation) 42.65.Re (Ultrafast processes; optical pulse generation and pulse compression) 42.50.Md (Optical transient phenomena: quantum beats, photon echo, free-induction decay, dephasings and revivals, optical nutation, and self-induced transparency)