国产掺镱锥形光纤实现百瓦毫焦级窄线宽纳秒脉冲输出

Output of 100 W 1-mJ narrow linewidth nanosecond-pulsed fiber amplifier based on home-made Yb-doped tapered fiber

摘要: 窄线宽大能量纳秒脉冲单模光纤放大器具有高效率、高光束质量和小体积等优点，在激光探测、工业加工等应用领域中具有明显的竞争优势。近期中国工程物理研究院激光聚变研究中心基于国产锥形掺镱光纤和主振荡功率放大器（MOPA），实现了平均功率100 W、脉冲宽度100 ns、单脉冲能量1 mJ、峰值功率10 kW的窄线宽（Δλ_3dB=0.49 nm）、线偏振（PER：12.3 dB）、近单模（M²=1.49）全光纤结构1 064 nm激光输出。通过优化增益光纤和放大器设计，可进一步提升放大器的输出能量、功率和光束质量。

Abstract: Thanks to the advantages of compact, high beam quality and high conversion efficiency, narrow linewidth high pulse energy single mode nanosecond-pulsed fiber amplifier is highly desired in laser detection and industry applications. Recently, an all-fiber amplifier with a home-made Yb-doped tapered fiber produces linearly polarized (12.3 dB PER) 100 ns, 1 mJ pulses with 0.49 nm linewidth, M²=1.49, 100 W of average output power and 10 kW peak power at 1 064 nm. It is believed that the pulse energy, output power and beam quality can be further improved by optimizing the Yb-doped fiber and design of amplifier.