千瓦级一体化全光纤激光振荡器  

Kilowatt-Level Monolithic All-Fiber Laser Oscillator

作　　者：李昊[1,2] 李宏业 李智贤 田鑫 王蒙 饶斌裕 武柏屹 奚小明 陈子伦 王泽锋 陈金宝 Li Hao;Li Hongye;Li Zhixian;Tian Xin;Wang Meng;Rao Binyu;Wu Baiyi;Xi Xiaoming;Chen Zilun;Wang Zefeng;Chen Jinbao(College of Advanced Interdisciplinary Studies,National University of Defense Technology,Changsha 410073,Hunan,China;State Key Laboratory of Pulsed Power Laser Technology,Changsha 410073,Hunan,China;Hunan Provincial Key Laboratory of High Energy Laser Technology,Changsha 410073,Hunan,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]脉冲功率激光技术国家重点实验室,湖南长沙410073 [3]高能激光技术湖南省重点实验室,湖南长沙410073

出　　处：《光学学报》2022年第23期11-16,共6页Acta Optica Sinica

基　　金：国家自然科学基金面上项目(11974427,12004431);湖南省科技创新人才计划科技创新领军人才项目(2021RC4027);脉冲功率激光国家重点实验室主任基金项目(SKL-2020-ZR05,SKL-2021-ZR01)。

摘　　要：基于飞秒激光刻写技术和侧面泵浦耦合技术,实现了主光路无熔接点的千瓦级一体化全光纤激光振荡器。采用飞秒激光与相位模板结合的刻写方法,在大模场双包层掺镱光纤上制备了一对光纤光栅,构成激光谐振腔,并采用拉锥-熔合法在同一根增益光纤上制备了两个侧面泵浦耦合器。以中心波长为976 nm的半导体激光器为泵浦源,获得了最大功率为1052 W、中心波长为1070 nm的激光输出,光光转换效率约为73%,光束质量因子M2约为1.8。演示了一种紧凑稳定的一体化光纤激光振荡器系统,并验证了其在实现高功率、高光束质量激光输出方面的潜力,其对高功率光纤激光技术的发展与应用具有重要的价值。Based on the femtosecond laser inscribing technology and side-pump coupling technology,a kilowatt-level monolithic all-fiber laser oscillator without fusion splice in the main optical path is obtained.In addition,a pair of fiber Bragg gratings are written in a large-mode-area and double-cladding ytterbium-doped fiber by combining femtosecond laser and phase mask,so as to form a resonant cavity.Meanwhile,two side-pump couplers are fabricated by tapered-fused technology in the same ytterbium-doped fiber.With a semiconductor laser of 976 nm as the pump source,the maximum output power of 1052 W is obtained at a center wavelength of 1070 nm,and the optical-optical conversion efficiency and the beam quality factor M2 are about 73%and 1.8,respectively.A compact and stable monolithic fiber laser oscillator system is presented,and its potential in realizing laser output with high power and high beam quality is demonstrated,which is of great value to the development and application of high-power fiber lasers.

关 键 词：光纤光学 光纤振荡器 光纤BRAGG光栅 侧面泵浦耦合器 高功率光纤激光器 

分 类 号：O436[机械工程—光学工程]