Abstract
The effect of Er3+ ion concentration and incoherent pumping field on the refractive index and group index in an Er3+: YAG crystal is investigated. It is shown that under different concentrations of Er3+ ion in the crystal, the index of refraction and absorption can be changed and a high index of refraction is accompanied by amplification in the medium. Also, it is shown that with the switching from subluminal to superluminal, or vice versa, light propagation can be obtained by different concentrations of Er3+ ions in the crystal.
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