线偏振超连续谱研究进展  

Review of Linearly Polarized Supercontinuum

作　　者：李博 陈胜平[1,2,3] 李敬岁 宋家鑫 宋锐 韩凯[1,2,3] Li Bo;Chen Shengping;Li Jingsui;Song Jiaxin;Song Rui;Han Kai(College of Advanced Interdisciplinary Studies,National University of Defense Technology,Changsha 410073,China;Nanhu Laser Laboratory,National University of Defense Technology,Changsha 410073,China;State Key Laboratory of Pulsed Power Laser Technology,National University of Defense Technology,Changsha 410073,China)

机构地区：[1]国防科技大学前沿交叉学科学院,湖南长沙410073 [2]国防科技大学南湖之光实验室,湖南长沙410073 [3]脉冲功率激光技术国家重点实验室,湖南长沙410073

出　　处：《光学学报》2023年第17期252-267,共16页Acta Optica Sinica

摘　　要：线偏振超连续谱光源是具有线偏振特性的宽光谱激光光源,是连接偏振光学与非线性光学的一个很好的纽带,在高光谱成像照明、光学相干层析等领域有重要应用。近几年关于线偏振超连续谱的研究报道逐渐增多,研究人员已经针对线偏振超连续谱的偏振度提高、相干性增强、光谱平坦度提高、功率提升以及光谱拓展等重点问题开展研究工作,并取得重要进展。本文介绍线偏振超连续谱的研究进展,总结分析线偏振超连续谱产生中的关键技术,并介绍与分析两种针对线偏振超连续谱的偏振消光比测量方法。Significance Linearly polarized supercontinuum laser source has linear polarization characteristics,which provides a new dimension for the research and application of supercontinuum.In recent years,many linearly polarized supercontinuum laser sources have been reported,and some achievements have been made in high birefringence realizing,high coherence and low noise,power increasing,and spectrum broadening.However,there are still some factors that limit the development of linearly polarized supercontinuum laser sources,and it is meaningful to make a summary and propose prospects for linearly polarized supercontinuum laser sources.In existing reports on linearly polarized supercontinuum,the phenomenon of polarization extinction ratio(PER)degradation of linearly polarized supercontinuum has been found.However,due to the inability of the existing method to reflect the polarization states at each wavelength of the linearly polarized supercontinuum,the reason for PER degradation cannot be explained.We introduce two PER measurement methods suitable for broadband linearly polarized supercontinuum laser sources.Progress We review the research results of linearly polarized supercontinuum fiber sources,mainly focusing on high PER realization,output power increasing,and spectrum broadening.The measurement methods of PER are introduced,especially two methods for linearly polarized supercontinuum laser sources.Conclusions and Prospects The research progress of linearly polarized supercontinuum is mainly listed below.1)The design of polarization-maintaining photonic crystal fiber(PM-PCF).Traditional polarization-maintaining fiber realizes birefringence through stress rods.The birefringence coefficient is usually on the order of 10−4.PM-PCF can achieve birefringence through the irregular arrangement of air holes.The birefringence coefficient of optimally designed PM-PCF reaches the order of 10−3 at the wavelength of above 1000 nm,resulting in a linearly polarized supercontinuum laser with PER of 21.2 dB.2)In terms of coheren

关 键 词：偏振消光比 线偏振 超连续谱 保偏光纤 光纤激光器 

分 类 号：O436[机械工程—光学工程]