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光纤中慢光群折射率限定特性研究
引用本文:邱巍,高波,刘健君,王誉达,吕品,蒋秋莉.光纤中慢光群折射率限定特性研究[J].发光学报,2017,38(3):380-386.
作者姓名:邱巍  高波  刘健君  王誉达  吕品  蒋秋莉
作者单位:1. 辽宁大学 物理学院, 辽宁 沈阳 110036; 2. 中国科学院 低温工程学重点实验室(理化技术研究所), 北京 100190
基金项目:国家自然科学基金,中国科学院国际大科学计划培训专项,中国科学院低温工程学重点实验室开放课题(CRYO201513)资助项目 Supported by National Natural Science Foundation of China,Cultivation Special Fund of International Big Science Project of Chinese Academy of Sciences,Open Subject of Key Laboratory of Cryogenics of Chinese Academy of Sciences
摘    要:粒子在基态和亚稳态之间的振荡会导致探测光吸收的降低,而探测光束在很窄的频率范围内吸收的降低,会使介质的感生折射率在同样范围内迅速变化,从而改变群折射率ng=n(ω)+ωdn/dω。本文利用光纤慢光理论,对不同条件下的群折射率限定和群速度的变化特性展开讨论。群折射率随光纤长度的增加而降低,不同离子浓度的掺铒光纤中慢光的感生群折射率均随调制频率的增加而降低,同时在不同的调制频率条件下,群折射率随入射信号光强度的增大均有一个饱和的过程。

关 键 词:光纤  群折射率  光速减慢
收稿时间:2016-09-26

Limitation of Group Refractive Index in An Optical Fiber at The Room Temperature
QIU Wei,GAO Bo,LIU Jian-jun,WANG Yu-da,LYU Pin,JIANG Qiu-li.Limitation of Group Refractive Index in An Optical Fiber at The Room Temperature[J].Chinese Journal of Luminescence,2017,38(3):380-386.
Authors:QIU Wei  GAO Bo  LIU Jian-jun  WANG Yu-da  LYU Pin  JIANG Qiu-li
Institution:1. Department of Physics, Liaoning University, Shenyang 110036, China; 2. Key Laboratory of Cryogenics, Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing 100190, China
Abstract:The electron population oscillating between the ground and metastable level in the beat frequency between the pump and probe beam can result in the reduced absorption of the probe wave.The probe wave experiences the reduction of absorption in a narrow frequency band,which corresponds to rapid changes of the refractive index.According to the equation of ng=n(ω)+ωdn/dω,the group refractive index will increase.Utilizing the theory of slow light,the limitation of group refractive index in different environments and the change of group velocity were discussed.It is found that the group refractive index decreases with the increasing of the fiber length.The group refractive indices in the fibers with different Er3+ concentration decrease with the increasing of the modulation frequency,and the group refractive index has a saturation process with the increasing of the signal power under different modulation frequency.
Keywords:optical fiber  group refractive index  slow light
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