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均匀展宽增益介质中超光速饱和现象的研究
The research on saturation of fast light in homogeneously broaden materials with gain
【摘要】 根据饱和增益理论分析可知,不同抽运光功率对应着介质不同的吸收和增益状态.在吸收介质中,相干布居振荡效应导致光脉冲经历饱和吸收,光脉冲传输延迟;在增益介质中,相干布居振荡效应导致光脉冲经历增益饱和,光脉冲传输超前.本文由铒离子的亚稳态速率方程出发,建立了掺铒光纤中超光速传输的理论模型,同时得到时间超前的数值解析表达式;讨论了低频率段超光速的饱和现象,即超光速在低频段并不随着抽运光功率的增强而加强,而在高频率段随抽运光功率的增加而加强.
【Abstract】 According to the analysis of gain theory,the absorption or gain of medium depends on pump power.The coherent population oscillation leads the pulse to experience absorption saturation and propagation delay in a medium with absorption.This effect induces the pulse to experience gain saturation and propagation advance in a medium with gain.Making use of the transition rate equation of metastable state poplation,we develop the model of fast light in erbium-doped optical fiber and obtain the analytic expression of time advance.We demonstrate that there is a saturation effect of fast light in low frequency region,but the fast light is enhanced with pump power increasing in high frequency region.
【Key words】 a material with gain; coherent population oscillation; fast light;
- 【文献出处】 物理学报 ,Acta Physica Sinica , 编辑部邮箱 ,2012年10期
- 【分类号】O437
- 【下载频次】92