论文标题
光谱宽阔的凸孔concave多通细胞
Spectral broadening in convex-concave multipass cells
论文作者
论文摘要
自2016年首次演示以来，多通频谱拓宽技术涵盖了令人印象深刻的脉冲能量（3 $μ$ J -100 MJ）和峰值功率（4 MW -100 GW）。目前，该技术在焦耳级别中的能量缩放受到光损伤，气体电离和时空光束不均匀性等现象的限制。这些局限性可以通过新型的多通凸孔布置来克服，后者表现出重要的特性，例如较大的模式大小和紧凑性。在原则实验中，260 FS，15 $μ$ J和200 $μ$ J的脉冲被扩展，随后压缩到大约50 fs，效率为90％，并且在整个梁曲线上具有出色的时空均匀性。
Since its first demonstration in 2016, the multi-pass spectral broadening technique has covered impressive ranges of pulse energy (3 $μ$J - 100 mJ) and peak power (4 MW - 100 GW). Energy scaling of this technique into the joule-level is currently limited by phenomena such as optical damage, gas ionization and spatio-spectral beam inhomogeneity. These limitations can be overcome by the novel multi-pass convex-concave arrangement, which exhibits crucial properties such as large mode size and compactness. In a proof-of-principle experiment, 260 fs, 15 $μ$J and 200 $μ$J pulses are broadened and subsequently compressed to approximately 50 fs with 90 % efficiency and excellent spatio-spectral homogeneity across the beam profile.
