中国物理B ›› 2007, Vol. 16 ›› Issue (8): 2400-2406.doi: 10.1088/1009-1963/16/8/041

• CLASSICAL AREAS OF PHENOMENOLOGY • 上一篇    下一篇

Effect of spontaneously generated coherence on inversionless lasing gain in an atomic system with Doppler broadening

马慧1, 谭霞1, 仝殿民1, 樊锡君1, 田淑芬2   

  1. (1)College of Physics and Electronics, Shandong Normal University, Jinan 250014, China; (2)Communication College, Shandong Normal University, Jinan 250014, China
  • 收稿日期:2006-10-06 修回日期:2007-02-13 出版日期:2007-08-20 发布日期:2007-08-20
  • 基金资助:
    Project supported by the National Natural Science Foundation of China (Grant No~10675076), the Natural Science Foundation of Shandong Province, China (Grant No~Y2006A21) and the State Key Laboratory of High Field Laser Physics, Shanghai Institute of Optic

Effect of spontaneously generated coherence on inversionless lasing gain in an atomic system with Doppler broadening

Ma Hui(马慧)a), Tan Xia(谭霞)a), Tian Shu-Fen(田淑芬)b), Tong Dian-Min(仝殿民)a), and Fan Xi-Jun(樊锡君)a)†   

  1. a College of Physics and Electronics, Shandong Normal University, Jinan 250014, China; b Communication College, Shandong Normal University, Jinan 250014, China
  • Received:2006-10-06 Revised:2007-02-13 Online:2007-08-20 Published:2007-08-20
  • Supported by:
    Project supported by the National Natural Science Foundation of China (Grant No~10675076), the Natural Science Foundation of Shandong Province, China (Grant No~Y2006A21) and the State Key Laboratory of High Field Laser Physics, Shanghai Institute of Optic

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摘要： We have studied the effect of the spontaneously generated coherence (SGC) on gain of lasing without inversion (LWI) in a closed three-level $\Lambda $-type atomic system with Doppler broadening. It is shown that, regardless of the driving and probe fields being co- or counter-propagating, at a suitable value of the Doppler width, we can obtain a much larger LWI gain with SGC than that without SGC; and the region of the LWI gain spectrum with SGC is obviously larger than that without SGC. When the Doppler width takes a constant value, the gain does not monotonically decrease or increase with increasing strength of SGC, the largest LWI gain can be obtained by adjusting strength of SGC. Generally speaking, the co-propagating probe and driving fields is favourable to obtain a larger LWI gain.

Abstract: We have studied the effect of the spontaneously generated coherence (SGC) on gain of lasing without inversion (LWI) in a closed three-level $\Lambda $-type atomic system with Doppler broadening. It is shown that, regardless of the driving and probe fields being co- or counter-propagating, at a suitable value of the Doppler width, we can obtain a much larger LWI gain with SGC than that without SGC; and the region of the LWI gain spectrum with SGC is obviously larger than that without SGC. When the Doppler width takes a constant value, the gain does not monotonically decrease or increase with increasing strength of SGC, the largest LWI gain can be obtained by adjusting strength of SGC. Generally speaking, the co-propagating probe and driving fields is favourable to obtain a larger LWI gain.

Key words: spontaneously generated coherence, Doppler broadening, lasing without inversion, gain

中图分类号:  (Photoionization and excitation)

  • 32.80.-t
32.70.Jz (Line shapes, widths, and shifts) 42.60.Lh (Efficiency, stability, gain, and other operational parameters)