We present amplification of short and ultrashort laser pulses at 1530-nm center wavelength using a large mode area Er-doped fiber (LMA-EDF). The mode area of about 1700 μm² tremendously increases the power handling capacity of the fiber and helps in achieving up to ∼ 17 dB/m gain with 10 W power of 980-nm wavelength pump. The LMA fiber used here is a 3-layer W-type fiber designed to have effective single mode operation with higher order mode discrimination and sufficient mode spacing between the first few modes to avoid any possible mode coupling. In particular, we numerically demonstrate the amplification of 300 fs, 1 kW peak power pulses to ∼ 20 fs, ∼2.6 MW peak power pulses in 1.5-m propagation distance, and of 50 ps, 1 kW peak power pulses to ∼ 65 ps, ∼26 MW peak power pulses in 3-m propagation distance of the LMA-EDF. The generated pulses would be useful in applications such as eye-safe remote sensing and 3D laser processing of silicon.

我们使用大模式面积掺铒光纤 (LMA-EDF) 在 1530 nm 中心波长处放大短和超短激光脉冲。模面积约1700 μm ²极大地提高了光纤的功率处理能力，并有助于在 980 nm 波长泵浦的 10 W 功率下实现高达 17 dB/m 的增益。此处使用的 LMA 光纤是 3 层 W 型光纤，旨在实现有效的单模操作，具有更高的阶模辨别力和前几个模式之间的足够模式间隔，以避免任何可能的模式耦合。特别是，我们在数值上证明了 300 fs、1 kW 峰值功率脉冲在 1.5 米传播距离内​​放大到～20 fs、～2.6 MW 峰值功率脉冲，以及 50 ps、1 kW 峰值功率脉冲放大到～ 65 ps，在 LMA-EDF 的 3 米传播距离内​​，~26 MW 峰值功率脉冲。产生的脉冲将在诸如人眼安全遥感和硅的 3D 激光加工等应用中有用。