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利用相干布居振荡技术在介质吸收光谱上产生烧孔,孔宽大约为基态粒子数恢复时间的倒数.由增益理论分析得到不同抽运光功率对介质吸收状态的影响.在介质的吸收区域,振荡导致光脉冲经历饱和吸收,脉冲传输延迟;在介质的增益区域,振荡又导致光脉冲经历增益饱和,脉冲传输超前.应用此技术在掺铒光纤中实现了光速人为可控.在掺铒光纤晶体中观测到了最慢为2.857×103m/s的光速减慢传输,相应感生群折射率为10.5×104.根据布居振荡效应及增益理论,由速率方程出发,得到了信号光的群延迟理论解析表达式,理论仿真与实际测量符合较好.以此理论为基础较全面地分析了实现光速可控的方法.
The effect of different pumping light power on the absorption state of the medium is obtained by gain theory analysis.In the medium absorption area, Oscillation causes the optical pulse to undergo saturation absorption and pulse propagation delay. In the gain region of the medium, the oscillation causes the optical pulse to undergo gain saturation and pulse transmission ahead. This technique is used to control the speed of light in erbium-doped fiber, The slowest transmission rate of 2.857 × 103m / s was observed in the crystal, and the corresponding refractive index of the induced group was 10.5 × 104. According to the population oscillation theory and gain theory, the group delay of signal light was obtained from the rate equation Theoretical analysis of the expression, the theoretical simulation and the actual measurement in good accordance with this theory is more comprehensive analysis of the speed controllable method.