Krylov Alexander, Senatorov Andrey, Gladyshev Alexey, Yatsenko Yury, Kosolapov Alexey, Kolyadin Anton, Khudyakov Maxim, Likhachev Mikhail, Bufetov Igor
Appl Opt. 2023 Jul 20;62(21):5745-5754. doi: 10.1364/AO.494799.
We report on the development of a chirped pulse amplification (CPA) designed erbium fiber source with a hybrid high-power amplifier, which is composed of erbium-doped and erbium/ytterbium-co-doped double-clad large-mode-area fibers. Stretched pulses from the high-power amplifier with up to 21.9 µJ energy and 198.5 kHz repetition rate are dechirped in the transmission grating pair-based compressor with 73% efficiency, yielding as short as 742 fs duration with 15.8 µJ energy and ≈13 peak power (maximum average power up to 3.14 W) at the central wavelength of 1.56 µm. Compressed pulses are coupled into microstructured negative-curvature hollow-core fibers with a single row capillary cladding and different core sizes of 34 µm and 75 µm in order to realize femtosecond pulse delivery with a diffraction-limited output beam ( ≤1.09) and demonstrate ∼200 Stokes pulse generation at 1712 nm via rotational SRS in pressurized hydrogen ( ). We believe that the developed system may be a prospect for high-precision material processing and other high-energy and high-peak-power laser applications.
我们报道了一种采用混合高功率放大器设计的啁啾脉冲放大（CPA）铒光纤源的研制情况，该放大器由掺铒和铒/镱共掺双包层大模面积光纤组成。来自高功率放大器的拉伸脉冲能量高达21.9 μJ，重复频率为198.5 kHz，在基于透射光栅对的压缩器中进行啁啾反转，效率为73%，在中心波长1.56 µm处产生的脉冲持续时间短至742 fs，能量为15.8 μJ，峰值功率约为13 GW（最大平均功率高达3.14 W）。压缩后的脉冲被耦合到具有单排毛细管包层、芯径分别为34 µm和75 µm的微结构负曲率空芯光纤中，以实现具有衍射极限输出光束（≤1.09）的飞秒脉冲传输，并在加压氢气中通过旋转受激拉曼散射（SRS）演示在1712 nm处产生约200 GW的斯托克斯脉冲。我们认为，所开发的系统有望应用于高精度材料加工及其他高能量、高峰值功率的激光应用。
