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)
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
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.
Received: 04 August 2006
Revised: 01 September 2006
Accepted manuscript online:
PACS:
42.50.Gy
(Effects of atomic coherence on propagation, absorption, and Amplification of light; electromagnetically induced transparency and Absorption)
Fund: 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.
Cite this article:
Cui Ni(崔妮), Fan Xi-Jun(樊锡君), Li Ai-Yun(李爱云), Liu Cheng-Pu(刘呈普), Gong Shang-Qing(龚尚庆), and Xu Zhi-Zhan(徐至展) Phase control in an open $\varLambda$-type system with spontaneously generated coherence 2007 Chinese Physics 16 718
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