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)†
a College of Physics and Electronics, Shandong Normal University, Jinan 250014, China; b Communication College, Shandong Normal University, Jinan 250014, China
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.
Received: 06 October 2006
Revised: 13 February 2007
Accepted manuscript online:
(Efficiency, stability, gain, and other operational parameters)
Fund: 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
Cite this article:
Ma Hui(马慧), Tan Xia(谭霞), Tian Shu-Fen(田淑芬), Tong Dian-Min(仝殿民), and Fan Xi-Jun(樊锡君) Effect of spontaneously generated coherence on inversionless lasing gain in an atomic system with Doppler broadening 2007 Chinese Physics 16 2400
Altmetric calculates a score based on the online attention an article receives. Each coloured thread in the circle represents a different type of online attention. The number in the centre is the Altmetric score. Social media and mainstream news media are the main sources that calculate the score. Reference managers such as Mendeley are also tracked but do not contribute to the score. Older articles often score higher because they have had more time to get noticed. To account for this, Altmetric has included the context data for other articles of a similar age.
