Effects of spontaneously induced coherence on absorption of a ladder-type atom
Ma Hong-Mei(马红梅)a)b), Gong Shang-Qing(龚尚庆)b), Sun Zhen-Rong(孙真荣)a), Li Ru-Xin(李儒新)b), and Xu Zhi-Zhan(徐至展)b)
a Key Laboratory of Optical and Magnetic Resonance Spectroscopy, East China Normal University, Shanghai 200062, China; b State Key Laboratory of High Field Laser Physics, Shanghai Institute of Optics and Fine Mechanics, Shanghai 201800, China
Abstract This paper investigates the effects of spontaneously induced coherence on absorption properties in a nearly equispaced three-level ladder-type system driven by two coherent fields. It find that the absorption properties of this system with the probe field applied on the lower transition can be significantly modified if this coherence is optimized. In the case of small spontaneous decay rate in the upper excited state, it finds that such coherence does not destroy the electromagnetically induced transparency (EIT). Nevertheless, the absorption peak on both sides of zero detuning and the linewidth of absorption line become larger and narrower than those in the case corresponding to the effects of spontaneously induced coherence; while in the case of large decay rate, it finds that, instead of EIT with low resonant absorption, a sharp absorption peak at resonance appears. That is, electromagnetically induced absorption in the nearly equispaced ladder-type system can occur due to such coherent effects.
Received: 18 October 2005
Revised: 27 February 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 Science Foundation of China (Grant No 10234030) and the Natural
Science Foundation of\linebreak
\makebox[1.6mm]{}Shanghai, China (Grant No 03ZR14102).
Cite this article:
Ma Hong-Mei(马红梅), Gong Shang-Qing(龚尚庆), Sun Zhen-Rong(孙真荣), Li Ru-Xin(李儒新), and Xu Zhi-Zhan(徐至展) Effects of spontaneously induced coherence on absorption of a ladder-type atom 2006 Chinese Physics 15 2588
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