光学学报, 2015, 35 (s2): s206005, 网络出版: 2015-10-08
全光纤保偏放大器产生196 W近红外超连续谱
196 W Near Infrared Supercontinuum Generation in an All-Fiber Polarization-Maintaining Power Amplifier
光纤光学 光纤激光器 高偏振度超连续谱 主振荡功率放大器 保偏放大器 双包层保偏掺镱光纤 fiber optics fiber laser high polarization supercontinuum master-oscillation power-amplifier polarization-maintaining amplifier double-cladding polarization-maintaining ytterbium
摘要
采用全光纤结构保偏光纤放大器生成了高偏振度超连续谱。种子源使用一个中心波长为1064 nm,重复频率、脉冲宽度均可调的保偏脉冲光纤激光器,将种子激光器设置在重复频率5 MHz,脉宽150 ps,输出功率80 mW。种子光经过一个主振荡功率放大(MOPA)结构的保偏光纤放大器进行功率放大,经过两级预放大器和一级主放大器进行功率放大,并在主放大器中使光谱展宽,产生了高偏振度的超连续谱激光。主放大器采用纤芯/内包层直径为25 μm/400 μm的保偏双包层掺镱光纤,其长度为11 m,在976 nm处的吸收系数为2.2 dB/m。当主放大器的抽运光功率为355 W时,得到的超连续谱激光输出平均功率为196 W,斜率效率为55%,输出光谱范围为0.85~1.86 μm。
Abstract
Polarization-maintaining (PM) supercontinuum is generated in an all-PM-fiber amplifier. A tunable fiber pulse laser with the central wavelength 1064 nm is used as the seed of the master-oscillation power-amplifier (MOPA), and the output power of the seed is 80 mW while the repetition frequency and the pulse width are tuned to 5 MHz and 150 ps, respectively. The pulse is amplified through two PM-pre-amplifiers and then coupled into 11 m long double-cladding PM ytterbium-doped fiber (YDF), which has core/inner-cladding dimensions of 25 μm/400 μm and the absorption coefficient of the fiber is 2.2 dB/m at 976 nm. With the pumped power of 355 W, the average power of the supercontinuum generated in the amplifier is measured as 196 W, with the slope efficiency of 55%, while the spectra extend from 0.85 μm to 1.86 μm.
张彬, 靳爱军, 马鹏飞, 陈胜平, 侯静. 全光纤保偏放大器产生196 W近红外超连续谱[J]. 光学学报, 2015, 35(s2): s206005. Zhang Bin, Jin Aijun, Ma Pengfei, Chen Shengping, Hou Jing. 196 W Near Infrared Supercontinuum Generation in an All-Fiber Polarization-Maintaining Power Amplifier[J]. Acta Optica Sinica, 2015, 35(s2): s206005.