Electromagnetically induced phase grating controlled by spontaneous emission |
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| Authors: | Bin Xie Xin Cai Zhi-Hong Xiao |
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| Institution: | 1. Jiangsu Province Key Lab of Modern Optics Technology, Soochow University, No.1 Shizi Street, Suzhou City, China;2. International Laboratory for Adaptaive Bio-nanotechology, Suzhou Institute of Nano-tech and Nano-bionics (SINANO), Chinese Academy of Science, China;3. School of Physics and Electronic Technology, Liaoning Normal University, Dalian 116029, China;1. School of Mechanical and Electronic Engineering, Suzhou University, Suzhou 234000, China;2. School of Mechanical and Vehicle Engineering, Anhui Polytechnic University, Wuhu 241000, China;1. Department of Physics, University of Shanghai For Science and Technology, Shanghai 200093, PR China;2. Department of Physics, South China University of Technology, Guangzhou 510640, PR China;1. Institute of Photonics and Technologies, National Tsing-Hua University, Hsinchu 300, Taiwan;2. Department of Physics, COMSATS Institute of Information Technology, Islamabad, Pakistan |
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| Abstract: | Electromagnetically induced phase grating controlled by spontaneous emission is studied. The results show that the diffraction efficiency of phase grating is strikingly enhanced due to the existence of spontaneously generated coherence (SGC), and the diffraction efficiency of 35% can be obtained in optimal SGC parameter case. Furthermore, at large SGC parameter, the high efficiency of phase grating can be maintained by the application of weak coupled and relatively strong probe fields, and choosing the proper length of atomic sample. At the same time, in such an atomic system, the SGC effect depends on incoherent pump. |
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