Center for Relativistic Laser Science, Institute for Basic Science, Gwangju, 61005, Republic of Korea.
Department of Physics and Photon Science, Gwangju Institute of Science and Technology, Gwangju, 61005, Republic of Korea.
Nat Commun. 2023 Apr 22;14(1):2328. doi: 10.1038/s41467-023-38087-3.
High-harmonic radiation can be generated when an ultra-intense laser beam is reflected from an over-dense plasma, known as a plasma mirror. It is considered a promising technique for generating intense attosecond pulses in the extreme ultraviolet and X-ray wavelength ranges. However, a solid target used for the formation of the over-dense plasma is completely damaged by the interaction. Thus, it is challenging to use a solid target for applications such as time-resolved studies and attosecond streaking experiments that require a large amount of data. Here we demonstrate that high-harmonic radiation can be continuously generated from a liquid plasma mirror in both the coherent wake emission and relativistic oscillating mirror regimes. These results will pave the way for the development of bright, stable, and high-repetition-rate attosecond light sources, which can greatly benefit the study of ultrafast laser-matter interactions.
当超强激光束从过密等离子体（即等离子体反射镜）反射时，会产生高次谐波辐射。这种技术有望在极紫外和 X 射线波长范围内产生高强度的阿秒脉冲。然而，用于形成过密等离子体的固体靶在相互作用下会被完全破坏。因此，对于需要大量数据的时间分辨研究和阿秒条纹实验等应用，使用固体靶是具有挑战性的。在这里，我们证明了在相干尾流发射和相对论振荡镜两种机制下，液体等离子体反射镜都可以连续产生高次谐波辐射。这些结果将为开发高亮度、稳定和高重复率的阿秒光源铺平道路，这将极大地促进超快激光与物质相互作用的研究。
