Hariton Victor, Jiang Yujiao, Schönberg Arthur, Seidel Marcus, Wieland Marek, Prandolini Mark J, Hartl Ingmar, Drescher Markus, Heyl Christoph M
Opt Lett. 2024 Jul 1;49(13):3769-3772. doi: 10.1364/OL.527988.
Ultrashort ultraviolet (UV) pulses are pivotal for resolving ultrafast electron dynamics. However, their efficient generation is strongly impeded by material dispersion and two-photon absorption, in particular, if pulse durations around a few tens of femtoseconds or below are targeted. Here, we present a new (to our knowledge) approach to ultrashort UV pulse generation: using the fourth-harmonic generation output of a commercial ytterbium laser system delivering 220 fs UV pulses, we implement a multi-pass cell (MPC) providing 5.6 µJ pulses at 256 nm, compressed to 30.5 fs. Our results set a short-wavelength record for MPC post-compression while offering attractive options to navigate the trade-off between upconversion efficiency and acceptance bandwidth for UV pulse production.
超短紫外（UV）脉冲对于解析超快电子动力学至关重要。然而，其有效产生受到材料色散和双光子吸收的强烈阻碍，特别是当目标脉冲持续时间在几十飞秒或更短时间左右时。在此，我们提出一种（据我们所知）产生超短紫外脉冲的新方法：利用商业镱激光系统的四次谐波产生输出，该系统可产生220飞秒的紫外脉冲，我们实现了一个多程池（MPC），在256纳米处提供5.6微焦的脉冲，压缩至30.5飞秒。我们的结果创造了多程池后压缩的短波长记录，同时为在紫外脉冲产生的上转换效率和接受带宽之间进行权衡提供了有吸引力的选择。
