拉锥光子晶体光纤光谱展宽性能退化的分析与改进  

Analysis and Improvement of Photonic Crystal Fiber Tapers for Spectral Broadening Degradation

作　　者：吴元杰[1,2] 叶慧琪[1,2] 韩建[1,2] 肖东[1,2] Wu Yuanjie;Ye Huiqi;Han Jian;Xiao Dong(Nanjing Institute of Astronomical Optics&Technology,National Astronomical Observatories,Chinese Academy of Sciences,Nanjing,Jiangsu 210042,China;Key Laboratory of Astronomical Optics&Technology,Nanjing Institute of Astronomical Optics&Technology,Chinese Academy of Sciences,Nanjing,Jiangsu 210042,China)

机构地区：[1]中国科学院国家天文台南京天文光学技术研究所,江苏南京210042 [2]中国科学院天文光学技术重点实验室(南京天文光学技术研究所),江苏南京210042

出　　处：《光学学报》2019年第11期99-104,共6页Acta Optica Sinica

基　　金：国家自然科学基金(11673046,11727806,11773044,11873071)

摘　　要：利用光谱展宽演化监测系统,观察光纤出射光的偏振消光比与光谱展宽的相关性。通过测量、比较和分析三根拉锥光子晶体光纤的寿命,可知光纤纤芯中存在对抽运光的四光子吸收过程,验证了拉锥光子晶体光纤光谱展宽性能退化是由光纤纤芯中多光子吸收效应产生的色心缺陷导致的。提出改用低光子能量的光源以大幅减缓多光子吸收效应的方案,并通过实验证实了使用1040 nm波长的抽运光可以有效延长拉锥光子晶体光纤的光谱展宽寿命。Herein, using a spectral broadening evolution testing setup, the relationship between the polarization-extinction ratio(PER) of the photonic crystal fiber(PCF) output light and spectral broadening evolution is observed. By measuring, comparing, and analyzing the lifetimes of the three tapered PCFs, we find that the tapered PCFs experience four-photon absorption processes at the pump light wavelength. The reason for the spectral broadening performance degradation of the tapered PCF is that the multiphoton absorption in the fiber core results in the color-center defect. A light source with low photon energy is proposed to reduce the multiphoton absorption. The experiment verifies that using the pump light with wavelength of 1040 nm can effectively prolong the spectral broadening lifetime of the tapered PCF.

关 键 词：光纤光学 光子晶体光纤 飞秒脉冲激光 光谱演化 多光子吸收 

分 类 号：O433[机械工程—光学工程]