中文摘要：

报道了一个高功率全光纤结构的中红外超连续谱激光源,该光源由1.55μm纳秒脉冲掺铒光纤激光器、包层抽运掺铥光纤放大器以及单模ZBLAN光纤组成。首先利用单模光纤将1.55μm纳秒脉冲激光频移至2.0μm波段,然后利用掺铥光纤放大器对其进行功率放大,最后利用ZBLAN光纤使掺铥光纤放大器输出的光谱进一步向中红外长波长方向扩展。当掺铥光纤放大器输出功率为3.95W时,ZBLAN光纤产生了2.2W的中红外超连续谱激光输出,相应的光谱范围为1.9~3.75μm,10dB光谱带宽大于1600nm。此外,通过增加掺铥光纤放大器的平均输出功率,中红外超连续谱的输出功率得到了进一步提高,当耦合进单模ZBLAN光纤的平均功率为21W时,中红外超连续谱的平均输出功率达到了16.2W,相应的光谱范围为1.9~3.5μm。

英文摘要：

A high-power all-fiber mid-infrared supercontinuum laser source that consists of a 1.55μm nanosecondpulsed erbium-doped fiber laser,a cladding-pumped thulium-doped fiber amplifier and a segment of single-mode ZBLAN fiber is reported.Firstly,the pulse breaks up through modulation instability and the laser shifts to a longer wavelength through Raman processes in the single-mode fiber.Secondly,the nanosecond pulses are amplified through a thulium-doped fiber amplifier.Finally,the output spectrum from the thulium-doped fiber amplifier is extended to the mid-infrared wavelength by using a segment of single-mode ZBLAN fiber.The output power from the ZBLAN fiber is 2.2 W with the launched pump power of 3.95 W at 2.0μm wavelength region,the emission spans the wavelength range from1.9μm to 3.75μm with a 10 dB bandwidth of greater than 1600 nm.In addition,a higher output power mid-infrared supercontinuum laser source is achieved by increasing the average output power of the thulium-doped fiber amplifier.The ZBLAN fiber produces an average output power of 16.2 W with the coupling pump power of 21 W at 2.0μm wavelength region,the emission spans the wavelength range from1.9μm to 3.5μm.