高功率全光纤掺镱皮秒光纤激光器  

High-Power All-Fiber Yb-Doped Picosecond Fiber Laser

作　　者：林怀钦[1] 郭春雨[1] 阮双琛[1] 欧阳德钦[1] 杨锦辉[1] 伍一鸣[1] 

机构地区：[1]深圳大学电子科学与技术学院,深圳市激光工程重点实验室,广东深圳518060

出　　处：《中国激光》2013年第7期69-73,共5页Chinese Journal of Lasers

基　　金：国家973计划(2010CB735904);国家自然科学基金(61275144);深圳市科技研发基金基础研究计划(JC201005250048A;110430002983024);深圳大学科研基金资助面上项目(201203)

摘　　要：采用四级主振荡功率放大(MOPA)结构,研制了高功率全光纤掺镱皮秒光纤激光器。种子源采用基于非线性偏振旋转(NPR)效应的被动锁模光纤激光器,中心波长为1062.8nm,重复频率为17.51MHz,谱线宽度为5nm,平均功率为7.14mW。为了抑制功率放大过程中的非线性效应,通过全光纤重复频率扩展器将种子脉冲激光的重复频率提高到281.7MHz。主功率放大级以长度为4.8m的大模场面积掺镱双包层光纤作为增益介质。在抽运功率为60W时,获得的最大平均输出功率为31.2W,光光转换效率为52%。输出激光脉冲的中心波长为1063.7nm,脉冲宽度为10.2ps,重复频率为281.7MHz,谱线宽度为7nm,并对激光脉冲的时域和频域特性进行了分析。A high-power all-fiber Yb-doped picosecond fiber laser is achieved via a four-stage master oscillator power amplifier （MOPA） configuration. The seed source is a passively mode-locked fiber laser based on nonlinear polarization rotation （NPR） effect, with a central wavelength of 1062.8 nm, a repetition rate of 17.51 MHz, a spectral linewidth of 5 nm and an average power of 7.14 mW. To suppress the nonlinear effects in the process of power scaling, the repetition rate is upgrade to about 281.7 MHz through an all-fiber repetition rate extender. A 4.8 m large mode area （LMA） Yb-doped double clad fiber is utilized as gain medium in the main power amplifier. The maximal average output power of 31.2 W is obtained at the pump power of 60 W, corresponding to an optical-to-optical conversion efficiency of 52%. The output laser pulse has a central wavelength of 1063.7 nm, a pulse duration of 10.2 ps, a repetition rate of 281.7 MHz and a spectral linewidth of 7 nm. Moreover, the characteristics of the laser pulse are analyzed both in time and frequency domain.

关 键 词：激光器 皮秒光纤激光器 主振荡功率放大 掺镱双包层光纤 被动锁模光纤激光器 全光纤 

分 类 号：TN248.1[电子电信—物理电子学]