掺镱光纤激光器实现1178 nm单频线偏振激光输出  

Ytterbium-doped single frequency fiber laser realizes linearly polarized operation at 1178 nm

作　　者：康芃睿 陶悦 莫正斐 姜曼 李灿 冷进勇 周朴[1] 姜宗福[1] KANG Pengrui;TAO Yue;MO Zhengfei;JIANG Man;LI Can;LENG Jinyong;ZHOU Pu;JIANG Zongfu(College of Advanced Interdisciplinary Studies,National University of Defense Technology,Changsha 410073,China;Nanhu Laser Laboratory,National University of Defense Technology,Changsha 410073,China;Hunan Provincial Key Laboratory of High Energy 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]国防科技大学高能激光技术湖南省重点实验室,湖南长沙410073

出　　处：《红外与激光工程》2024年第10期271-274,共4页Infrared and Laser Engineering

基　　金：国家重点研发计划项目(2020YFC2200401,2022YFB3606000)。

摘　　要：1178 nm单频光纤激光倍频后可以获得黄光,在钠激光导引星等领域有重要应用需求。然而,由于掺镱光纤在1178 nm处发射截面小,且存在严重的短波寄生振荡效应,基于掺镱光纤实现1178 nm单频激光输出面临较大的挑战。利用基于一段刻写在5 cm长度掺镱光纤上的光栅搭建基于分布反馈(DFB)结构的光纤激光器,实现了线宽为27.61 kHz(0.1 ms积分时间)、最高功率为13 mW、偏振消光比达到19.7 dB的1178.01 nm单频激光输出,是目前基于掺镱光纤实现的最长波长单频激光输出。Objective Thanks to the promising performances of narrow spectral linewidth,low noise and high coherence,single-frequency fiber lasers(SFFLs)have attracted considerable interests for a variety of applications including gravitational wave detection,LIDAR and nonlinear frequency conversion.In the 1.0µm spectral band,singlefrequency lasing from rare earth doped fibers mainly operates in the 1000-1120 nm wavelength region.However,for applications such as metrology and atomic spectroscopy that employ SFFLs in the visible band,extending the operation wavelength range to meet the application needs is urgently required.In particular,frequency doubling of 1178 nm SFFL to produce yellow light is crucially demanded in laser-guide-star detection.However,the large gain of ytterbium-doped fiber(YDF)between 1030 and 1100 nm would induce very strong amplified spontaneous emission(ASE)and lead to parasitic lasing,limiting the available lasing at 1178 nm.Methods This paper presents the realization of a high-performance 1178 nm SFFL based on the DFB(distributed feedback)structure.By inscribing a periodic structure on a 5 cm long YDF and introducing aπ-phase shift point in the fiber Bragg grating,an extremely narrow spectral transmission window was formed,ultimately resulting in single-frequency laser output.The structural setup of the laser is depicted in Fig.1,where pumping light was coupled into the phase-shifted grating through a wavelength division multiplexer(WDM).The output laser was then tested through the backward output end of the WDM.Results and Discussions The output power of the laser varies with the pumping power was recorded and shown in Fig.2,where it can be seen that the maximum output power of the laser is 13.0 mW and the slope efficiency is 6.92%.The spectrum at maximum output power is illustrated in Fig.3,showing an output wavelength of 1178.01 nm with an overall signal-to-noise ratio up to 63 dB.To verify the single-frequency characteristics of the laser operation,its longitudinal mode was tested and shown in

关 键 词：光纤激光 单频 掺镱光纤 分布反馈结构 

分 类 号：TN248[电子电信—物理电子学]