Observation of spontaneously generated coherence on absorption in rubidium atomic beam |
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| Authors: | Si-Cong Tian Zhi-Hui Kang Chun-Liang Wang Ren-Gang Wan Jun Kou Hang Zhang Yun Jiang Hai-Ning Cui Jin-Yue Gao |
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| Institution: | 1. College of Physics, Jilin University, Changchun 130023, PR China;2. Key Laboratory of Coherent Light and Atomic and Molecular Spectroscopy of Ministry of Education, Jilin University, PR China;3. College of Physics, Northeast Normal University, Changchun 130023, PR China;4. Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences, PR China;1. School of Physics and Information Technology, Shaanxi Normal University, Xi''an 710062, China;2. Department of Physics and Astronomy, Texas A&M University, College Station, TX 77843, USA;3. Teaching and Research Section of Physics, Foundation Department, Engineering University of CAPF, Xi''an 710086, China;1. Information Science and Engineering College, Dalian Polytechnic University, Dalian 116034, China;2. Institution of Theoretical Physics, School of Physics, Northeast Normal University, Changchun 130024, China;1. College of Physics and Electronic Science, Hubei Normal University, Huangshi 435002, China;2. School of Mathematics and Physics, China University of Geosciences, Wuhan 430074, China;3. School of Physics and Information Technology, Shaanxi Normal University, Xi’an 710119, China |
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| Abstract: | We report the experimental observation of the effect of spontaneously generated coherence on absorption without the rigorous requirement of close-lying levels. The experiments are studied in both a four-level N-type and a four-level inverted-Y-type atomic system in a rubidium atomic beam. With the coupling and controlling field, the N-type system is equivalent to a system with three closely upper levels coupled to one lower level by the same vacuum modes. The quantum interference can induce two prominent and nearly transparent holes where the slope of the refractive index is very steep. This special situation could allow the simultaneous propagation of two weak pulses with different frequencies. When we tune the wavelength of the controlling field, the N-type system turns to be the inverted-Y atomic system. Under the two-photon resonance condition, the system is equivalent to a V-type system with two closely upper levels, and the interference can reduce one broad transparency window in the middle of the absorption spectrum. Besides we can control the number of the spontaneously decay channels by the detuning of the controlling field, thus the effect of spontaneously generated coherence can exist in three or two closely space levels. |
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