2.8μm中红外同步泵浦锁模光纤激光器  

2.8 μm Mid-Infrared Synchronously Pumped Mode-Locked Fiber Laser

作　　者：樊浩泽 梁金辉 郑树锴 蒋瑜 陈汉波 沈鹏生 李殿甲 於林鹏 罗兴 王金章[1] 闫培光[1] 杜晨林 郭春雨[1] 吕启涛 阮双琛[1,2] Fan Haoze;Liang Jinhui;Zheng Shukai;Jiang Yu;Chen Hanbo;Shen Pengsheng;Li Dianjia;Yu Linpeng;Luo Xing;Wang Jinzhang;Yan Peiguang;Du Chenlin;Guo Chunyu;LüQitao;Ruan Shuangchen(Shenzhen Key Laboratory of Laser Engineering,College of Physical and Optoelectronic Engineering,Shenzhen University,Shenzhen,Guangdong 518060 China;Key Laboratory of Advanced Optical Precision Manufacturing Technology of Guangdong Higher Education Institutes,Shenzhen Technology University,Shenzhen,Guangdong 518118,China;Han's Laser Technology Co.,Ltd.,Shenzhen,Guangdong 518000,China)

机构地区：[1]深圳大学物理与光电工程学院深圳市激光工程重点实验室,广东深圳518060 [2]深圳技术大学先进光学精密制造技术广东普通高校重点实验室,广东深圳518118 [3]大族激光科技股份有限公司,广东深圳518000

出　　处：《中国激光》2022年第1期214-222,共9页Chinese Journal of Lasers

基　　金：国家自然科学基金(61975136,61935014,61775146);广东省自然科学基金(2019A1515010699);深圳市承接国家重大科技项目(CJGJZD20200617103003009)。

摘　　要：2.8μm波段中红外光纤激光器在激光医疗领域具有重要的应用,受到广泛关注。研究并实现了2.8μm同步泵浦锁模脉冲光纤激光器。自主研制了大功率单模976nm皮秒脉冲激光器并以此作为泵浦源,以掺铒氟化物光纤环形腔作为谐振器,通过纤芯同步泵浦的方式,在交叉相位调制作用下实现了2.8μm同步泵浦锁模脉冲激光器的制备。锁模脉冲的中心波长为2784.7nm,重复频率为6.534 MHz,脉冲宽度接近光电探测器极限。所提方案不需要在谐振器内插入任何中红外主动或被动调制器,具有系统稳定性好和易于实现全光纤化等优势。Objective 2.8μm pulsed laser sources are ideally suited for medical applications,since the absorption of water in this wavelength range is quite strong(~10^(4) cm^(-1)).As human tissue contains a large amount of water,the laser penetration depth of mid-IR light is only in the order of a few or a few tens of micrometers,which allows for highly precise cutting of biological tissue.At present,pulsed lasers with a high peak power are mainly obtained by active mode locking and passive mode locking.However,2.8μm mode-locked lasers are not only limited by the active and passive modulation devices,but also face the system stability problems associated with the mode-locking technology.Based on semiconductor saturable absorber mirrors and new two-dimensional material saturable absorbers such as graphene,black phosphorus and transition metal dichalcogenides,the generation of a 2.8μm mid-infrared fiber passive mode-locked pulsed laser has been realized.However,these saturable absorbers are faced with problems such as easy damage to devices and long-term performance degradation due to deliquescent and oxidation.In addition,the “artificial saturable absorber”material based on the nonlinear polarization rotation evolution(NPE)effect is also used to realize the generation of mode-locked pulses in the 2.8μm band.For NPE passive mode-locked fiber lasers,environmental factors such as external temperature and strain have a serious impact on the start and operation of mode-locking.Changes in the environment can easily change the polarization state and cause the system to lose lock.In this article,we report a 2.8μm mid-infrared synchronously pumped mode-locked fiber laser.This method does not require any active and passive modulation devices to be inserted into the resonator,and does not cause damages to the modulation devices.Therefore,fiber lasers based on the synchronous pump mode locking technology have high system stability and are expected to achieve an entirely monolithic mid-infrared mode-locked pulsed fiber laser.Met

关 键 词：激光器 中红外激光 同步泵浦锁模 交叉相位调制 

分 类 号：TN248[电子电信—物理电子学]