Effect of concentration of Er3+ ions on ultra-large index of refraction via atomic coherence in Er3+: YAG crystal |
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| Authors: | Zhang Hui-Fang Dai Zhen-Wen Zhang Bing Wu Jin-Hui and Gao Jin-Yue |
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| Affiliation: | College of Physics, Jilin University, Changchun 130023, China; Key Laboratory of Coherent Light, Atomic and Molecular Spectroscopy, Ministry of Education of China, Jilin University, Changchun 130023, China |
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| Abstract: | A four-level system is proposed to produce large index of refraction accompanied by vanishing absorption in the Er^{3+}-doped yttrium aluminium garnet (YAG) crystal. It is found that the high index of refraction with zero absorption can be provided by adjusting the incoherent pumping, the coherent field, as well as the concentration of Er^{3+} ions in the crystal. Furthermore, the value of the incoherent pump to achieve the high index of refraction with zero absorption is greatly changed with increasing the concentration of Er^{3+} ions in the crystal. This indicates that the effect of concentration on the high index of refraction with zero absorption cannot be neglected. |
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| Keywords: | electromagnetically induced transparency concentration high index of refraction with zero absorption |
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