Grupo de Investigación en Óptica Extrema (GIOE), Universidad de Salamanca, Pl. Merced s/n, Salamanca E-37008, Spain.
Opt Lett. 2011 Oct 1;36(19):3867-9. doi: 10.1364/OL.36.003867.
The energy scaling up of pulse postcompression is still an open issue. In this work we analyze the use of astigmatic focusing to improve the output pulses in a filamentation based postcompression setup. Unlike spherical conditions, astigmatic focusing enhances the output energy and the spectral broadening of the filament. This is due to the increase of critical power, allowing a considerable improvement of the postcompression energy and stability in a simple way. We demonstrated compression from FWHM 100 fs, 10 nm, 3 mJ input pulses to 13 fs, 142 nm, near 1 mJ pulses.
脉冲后压缩的能量提升仍然是一个未解决的问题。在这项工作中，我们分析了像散聚焦在基于细丝的后压缩设置中改善输出脉冲的应用。与球形条件不同，像散聚焦增强了细丝的输出能量和光谱展宽。这是由于临界功率的增加，以简单的方式实现了后压缩能量和稳定性的显著改善。我们演示了从 FWHM 为 100fs、10nm、3mJ 的输入脉冲压缩至 FWHM 为 13fs、142nm、接近 1mJ 的脉冲。
