无拍频1570 nm光纤激光器及其在2µm波段激光产生中的应用  

Beat-free 1570 nm fiber laser and its application in 2µm wave band fiber laser generation

作　　者：李晨睿 李香乐 应佳峻 吴怡童 盛雨齐 周勇[1] 高伟清[1] LI Chenrui;LI Xiangle;YING Jiajun;WU Yitong;SHENG Yuqi;ZHOU Yong;GAO Weiqing(School of Physics,Hefei University of Technology,Hefei 230009,China)

机构地区：[1]合肥工业大学物理学院,安徽合肥230009

出　　处：《量子电子学报》2022年第4期591-597,共7页Chinese Journal of Quantum Electronics

基　　金：国家自然科学基金(61875052,61905059);安徽省自然科学基金(1908085QF273);中央高校基本科研业务费(PA2019GDQT0007,JZ2020HGTB0065)。

摘　　要：实验研究了基于光纤布拉格光栅(FBG)的直接输出1570 nm单波长光纤激光器,采用光纤耦合器搭建塞格纳克宽带反射器并与部分反射光纤光栅构建直腔激光器,通过优化光栅反射率和输出方向实现了最高谐振效率为24.42%、最大输出功率为2.8 W、边模抑制比为65 dB的1570 nm光纤激光直接输出。通过增大腔长增加激光器谐振纵模数量,从而基于纵模间的平均效应实现了1570 nm单波长光纤激光器的稳定无拍频输出,进而利用该激光器作为掺铥光纤的泵浦源实现了2µm波段光纤激光器被动锁模输出。A 1570 nm single-wavelength fiber laser based on fiber Bragg grating(FBG)with direct emission was demonstrated in this work.A Sagnac broadband reflector composed of fiber coupler and a output coupler composed of a partial reflection FBG were used to build a straight cavity fiber laser.By optimizing the reflectivity of the FBG and output direction,the highest resonant efficiency of 24.42%was realized with the maximum output power of 2.834 W and the side mode suppression ratio of 65 dB.By increasing the cavity length to increase the number of resonant longitudinal modes,the stable beat-free laser emission of 1570 nm single wavelength fiber laser was obtained based on the average effect among the longitudinal modes.And then,the passively mode-locked output of 2µm-band fiber laser was realized by utilizing the 1570 nm fiber laser as the pump source of thulium-doped fiber.

关 键 词：激光技术 中红外光纤激光器 光纤布拉格光栅 无拍频激光器 被动锁模 

分 类 号：TN248.1[电子电信—物理电子学]