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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。
Reported a high power all-fiber structure of the mid-IR supercontinuum laser source, the light source consists of 1.55μm nanosecond pulse erbium-doped fiber lasers, clad pumped fiber amplifier and single-mode ZBLAN optical fiber composition. First, a single-mode fiber is used to shift 1.55μm nanosecond pulse laser frequency to 2.0μm wavelength band, and then amplified by a doped fiber amplifier. Finally, the output spectrum of the doped fiber amplifier is further amplified by the ZBLAN fiber to the mid-infrared long wavelength direction Expand. When the output power of the doped fiber amplifier is 3.95W, the ZWLAN fiber produces a 2.2W mid-IR supercontinuum laser output with a corresponding spectral range of 1.9-3.75μm and a 10dB spectral bandwidth greater than 1600nm. In addition, the output power of the mid-IR supercontinuum is further increased by increasing the average output power of the doped 铥 fiber amplifier. When the average power coupled into a single mode ZBLAN fiber is 21W, the average output power of the mid-IR supercontinuum reaches 16.2W, the corresponding spectral range of 1.9 ~ 3.5μm.