中国物理B ›› 2007, Vol. 16 ›› Issue (3): 718-724.doi: 10.1088/1009-1963/16/3/026

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Phase control in an open Λ-type system with spontaneously generated coherence

崔妮1, 樊锡君1, 李爱云1, 刘呈普2, 龚尚庆3, 徐至展3   

  1. (1)Department of Physics, Shandong Normal University, Jinan 250014, Chian; (2)Institute of Advanced Energy, Kyoto University, Gokasho, Uji, Kyoto 611-0011, Japan; (3)Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai 201800, China
  • 收稿日期:2006-08-04 修回日期:2006-09-01 出版日期:2007-03-20 发布日期:2007-03-20
  • 基金资助:
    Project supported by the National Basic Research Program of China (Grant No~2006CB806003) and by State Key Laboratory of High Field Laser Physics, Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences.

Phase control in an open $\varLambda$-type system with spontaneously generated coherence

Cui Ni(崔妮)a), Fan Xi-Jun(樊锡君)a)†, Li Ai-Yun(李爱云)a), Liu Cheng-Pu(刘呈普)b), Gong Shang-Qing(龚尚庆)c), and Xu Zhi-Zhan(徐至展)c)   

  1. a Department of Physics, Shandong Normal University, Jinan 250014, Chian; b Institute of Advanced Energy, Kyoto University, Gokasho, Uji, Kyoto 611-0011, Japan; c Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai 201800, China
  • Received:2006-08-04 Revised:2006-09-01 Online:2007-03-20 Published:2007-03-20
  • Supported by:
    Project supported by the National Basic Research Program of China (Grant No~2006CB806003) and by State Key Laboratory of High Field Laser Physics, Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences.

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摘要： This paper investigates the control role of the relative phase between the probe and driving fields on the gain, dispersion and populations in an open \Lambda system with spontaneously generated coherence (SGC). It shows that by adjusting the value of the relative phase, a change from lasing with inversion to lasing without inversion can be realized; the values and frequency spectrum regions of the inversionless gain and dispersion can be obviously varied; high refractive index with zero absorption and electromagnetically induced transparency can be achieved. It is also found that when the driving field is resonant, the shapes of the dispersion and the gain curves versus the probe detuning are very similar if the relative phase of the dispersion lags \pi/2 than that of the gain, however for the off-resonant driving field the similarity will disappear; the gain, dispersion and populations are periodical functions of the relative phase, the modulation period is always 2\pi; the contribution of SGC to the inversionless gain and dispersion is much larger than that of the dynamically induced coherence.

关键词: spontaneously generated coherence, phase control, electromagnetically induced transparency, lasing without inversion

Abstract: This paper investigates the control role of the relative phase between the probe and driving fields on the gain, dispersion and populations in an open $\varLambda$ system with spontaneously generated coherence (SGC). It shows that by adjusting the value of the relative phase, a change from lasing with inversion to lasing without inversion can be realized; the values and frequency spectrum regions of the inversionless gain and dispersion can be obviously varied; high refractive index with zero absorption and electromagnetically induced transparency can be achieved. It is also found that when the driving field is resonant, the shapes of the dispersion and the gain curves versus the probe detuning are very similar if the relative phase of the dispersion lags $\pi/2$  than that of the gain, however for the off-resonant driving field the similarity will disappear; the gain, dispersion and populations are periodical functions of the relative phase, the modulation period is always $2\pi$; the contribution of SGC to the inversionless gain and dispersion is much larger than that of the dynamically induced coherence.

Key words: spontaneously generated coherence, phase control, electromagnetically induced transparency, lasing without inversion

中图分类号:  (Effects of atomic coherence on propagation, absorption, and Amplification of light; electromagnetically induced transparency and Absorption)

  • 42.50.Gy
32.80.-t (Photoionization and excitation)