掺铥光纤放大器中的超连续谱输出  

Supercontinuum Generation in a Tm-Doped Fiber Amplifier

作　　者：陶蒙蒙[1,2] 王振宝[1,2] 谌鸿伟[1,2] 沈炎龙[1,2] 闫燕[1,2] 

机构地区：[1]西北核技术研究所,西安710024 [2]激光与物质相互作用国家重点实验室,西安710024

出　　处：《现代应用物理》2017年第1期23-27,共5页Modern Applied Physics

基　　金：激光与物质相互作用国家重点实验室基金资助项目(SKLLIM1409)

摘　　要：用增益开关掺铥光纤激光器作种子源,搭建了一个掺铥光纤主振荡放大系统。该系统增益开关种子源最大输出功率约为250mW,斜效率为28.5%;脉冲宽度为56.5ns,脉冲峰值功率为221.2 W,对应的峰值功率密度约为0.35 GW·cm^(-2),输出光谱的3dB线宽仅0.09nm,中心波长在1 942nm处。经一级放大后,激光器输出功率提高到1.33W,一级放大器斜效率达48.6%。同时,峰值功率提高到1.2kW,对应的峰值功率密度达1.86GW·cm^(-2)。此时,受光谱仪分辨率的限制,测得的激光3dB线宽仅为0.06nm。在二级放大器中观察到了超连续谱输出。超连续谱覆盖2~2.6μm的光谱范围,3dB带宽约490nm。A Tm-doped fiber master oscillator power amplifier system is built based on a gain-switched seed laser. The maximum output power of the gain-switched seed laser is a-bout 250 mW with a slope efficiency of 28.5%. With a pulse duration of 56.5 ns, the peak power of the gain-switched laser pulse is 221.2 W, corresponding to a peak power density of 0.35 GW·cm^-2, and the 3 dB linewidth of the output spectrum is 0.09 nm centering at 1 942 nm. In the first-stage amplifier, the maximum output power is about 1.33 W with a slope ef-ficiency of 48.6%. The corresponded peak power of the laser pulses is boosted to 1.2 kW with the peak power density reaching 1.86 GW·cm^-2, and the 3 dB linewidth of output spec-trum is only 0.06 nm limited by the resolution capability of the optical spectrum analyzer.Then, the supercontinuum generation is observed in the second-stage amplifier. The 3 dB bandwidth of the generated supercontinuum is about 490 nm covering a broad wavelength band from 2 jum to 2.6 jum.

关 键 词：增益开关 掺铥光纤放大器 超连续谱 

分 类 号：TN248.1[电子电信—物理电子学]