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
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.
Received: 20 December 2002
Revised: 01 April 2003
Accepted manuscript online:
(Effects of atomic coherence on propagation, absorption, and Amplification of light; electromagnetically induced transparency and Absorption)
Fund: Project supported in part by the National Natural Science Foundation of China (Grant No 60078015), the Doctoral Programme Foundation of the Institution of Higher Education of China (Grant No 19201038), and the Young Teacher Foundation of Jilin University, China.
Cite this article:
Zhang Hui-Fang (张惠芳), Dai Zhen-Wen (戴振文), Zhang Bing (张冰), Wu Jin-Hui (吴金辉), Gao Jin-Yue (高锦岳) Effect of concentration of Er3+ ions on ultra-large index of refraction via atomic coherence in Er3+: YAG crystal 2003 Chinese Physics 12 964
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