科研之友
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摘要
We demonstrated a broadband mid-infrared (mid-IR) supercontinuum (SC) directly generated in telecommunication multimode fiber (MMF) pumped by 2.054 mu m nanosecond laser pulses. The characteristics of mid-IR SC, including the output spectrum, pulse energy, and optic-tooptic conversion efficiency, were exhaustively investigated at different pump powers and fiber lengths. The nonlinear processes for SC generation in fiber were analyzed, and the frequency shift of the modulation instability (MI) was theoretically calculated, which was close to the experimental data. The output SC pulse shapes were measured in different output powers, and no split was found. The SC laser beam was nearly diffraction limited with an M-2 = 1.15 in 2.1 mu m measured by the traveling knife-edge method, and the laser beam spot was monitored by an infrared vidicon camera.
- 出版日期2016-4
- 单位中国人民解放军海军航空工程学院; 哈尔滨工业大学
