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采用波长为2μm、脉冲宽度为50 ns的掺铥光纤调Q激光器作为抽运光源,纤芯掺锗浓度为75%的石英光纤为非线性介质,进行了中红外超连续谱产生的研究。实验过程中在掺锗石英光纤的抽运光输入端熔接一截100~200μm长的多模光纤以提高光纤的空间耦合效率和损毁阈值,通过优化掺锗石英光纤的长度,最终在1.9μm(受光谱仪测量范围限制)~2.9μm范围内获得了较平坦的超连续谱输出,10 d B带宽和20 d B带宽分别达到950 nm和980 nm,而且其长波限接近目前报道的基于同类光纤的超连续谱的最大长波限。
The production of mid-IR supercontinuum was studied by using a doped 铥 fiber Q-switched laser with a wavelength of 2μm and a pulse width of 50 ns as a pump light source and a silica fiber with a germanium concentration of 75% as a nonlinear medium. During the experiment, a length of 100 ~ 200μm multimode fiber was welded on the pump light input end of the germanium doped silica fiber to improve the space coupling efficiency and damage threshold of the fiber. By optimizing the length of the germanium doped silica fiber, The spectral bandwidth of 10 d B and 20 d B are 950 nm and 980 nm, respectively, and its long-wavelength limit is close to that of the currently reported fiber-based The maximum length limit of supercontinuum.