Speaker
Xue Yu Zhang
Description
See the full Abstract at http://ocs.ciemat.es/EPS2018ABS/pdf/P5.2020.pdf
Attosecond pulse from laser-irradiated near-critical-density plasmas
Y. X. Zhang1,2 , B. Qiao1,3 , X. R. Xu1 , H. X. Chang1 , H. Zhang3 , C. T. Zhou1,3 , M. Zepf 2,4 ,X. T. He1,3
1 School of Physics, Peking University, Beijing, China
2 Helmholtz Institute Jena, Jena, Germany
3 Collaborative Innovation Center of IFSA (CICIFSA), Shanghai, China
4 Department of Physics and Astronomy, Queen’s University, Belfast, United Kingdom
The birth of high-intensity attoseocnd source has extended human measurement and control
techniques into atomic-scale electronic dynamics. High harmonic generation from laser-plasma
interaction has been regarded as one of the most promising routes to obtain such attosecond
light. Here, we propose a new practical approach of obtaining intense attosecond pulses by a
laser pulse interacting with near-critical-density (NCD) plasmas. The unique interaction dynam-
ics in NCD plasmas have been identified theoretically and by particle-in-cell simulations (Fig.
1), which show that three distinct dense electron nanobunches are formed each half a laser cycle
and two of them can induce intense attosecond pulses in respectively the reflected and transmit-
ted directions by the so-called “coherent synchrotron emission” (CSE) mechanism. Comparing
with CSE in solids, not only the required stringent conditions on laser and target are relaxed,
but also the radiation intensities are enhanced by two orders of magnitude.
(a) (b) (c) (d)
Figure 1: Schematic figures to show different nonlinear dynamics at different moments in NCD targets
References
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Nat. Phys. 8, 804 (2012).
[2] Y. X. Zhang, B. Qiao, X. Xu, H. X. Chang, H. Lu, C. T. Zhou, H. Zhang, S. P. Zhu, M. Zepf, and X. T. He,
Opt. Express, 25(23), 29058-29067 (2017).
[3] Y. X. Zhang, B. Qiao, X. R. Xu, H. X. Chang, H. Zhang, H. Y. Lu, M. Y. Yu, C. T. Zhou, S. P. Zhu, and X. T.
He, Phys. Plasmas 24(12), 123119 (2017).
