Watt-level gain-switched fiber laser at 346 μm

作者：Hongyu Luo, Jian Wei Yang, Fei Liu, Zhu Hu, Yao Xu, Fei Yan, Hanlin Peng, François Ouellette, Jianfeng Li, Yong Liu · 发表于：Optics Express · 年份：2019 · DOI：10.1364/oe.27.001367 · 被引用次数：48 · 研究领域：Photonic Crystal and Fiber Optics、Advanced Fiber Laser Technologies、Advanced Fiber Optic Sensors

We demonstrate a gain-switched fiber laser, yielding a maximum average power of 1.04 W at 3.46 μm, which is the current record of a pulsed rare-earth-doped fiber laser at the wavelength beyond 3 μm, to our knowledge. The corresponding pulse energy is 10.4 μJ with a repetition rate of 100 kHz. A dual-wavelength pumping scheme consisting of a home-made 1950 nm passively Q-switched fiber laser system with a μs-scale pulse width. A 976 nm continuous wave laser diode was used to gain-switch a double-cladding Er-doped ZBLAN fiber laser cavity. Possible laser-quenching behavior during a single-pump pulse was circumvented for the moderate pump peak power and relatively large-pump pulse width. Synchronous gain-switched pulses were achieved with a tunable repetition rate at a wide range of 55~120 kHz, which is the highest gain-switching repetition rate at this band and only limited by our pulsed-pump source. Moreover, the significance of pump pulse width for repetition rate improvement is also discussed. These results provide an available way to produce high-power pulses at the mid-infrared range of 3~5 μm.