Speaker
Mingyuan Shi
Description
See the full Abstract at http://ocs.ciemat.es/EPS2018ABS/pdf/P5.2038.pdf
Single attosecond pulse generation by two chirped laser pulses interaction
with plasmas
M. Y. Shi1 , Y. X. Zhang1,2 , S. Rykovanov1 , M. Zepf 1,3
1 Helmholtz Institute Jena, Jena, Germany
2 School of Physics, Peking University, Beijing, China
3 Department of Physics and Astronomy, Queen’s University, Belfast, United Kingdom
Extreme ultra-violent (XUV) and X-rays with duration of a few tens of attoseconds can be
used as ideal tools to explore nonlinear ultrafast dynamical processes in atoms and molecules,
such as the doubly-ionization, atomic core excitation and atto-ionization of Fano resonances
processes. Such attosecond light can be produced with phase-locked high harmonics generation
(HHG) by laser-matter (gas or plasma targets) interaction. For many applications, usually the
generation of high-energy isolated attosecond light pulses is much more advantageous, becasue
intense isloated attosecond pulses will open the door to nonlinear processes in XUV or X-ray
spectra region with attosecond resolution in the perturbative domin, especially for pump-probe
technologies.
Several technologies such as polarization gating, spatiotemporal gating and temporal gating,
have been proposed to isolate pulses. Besides, a single attosecond pulse can be also obtained
by controlling the carrier envelope phase (CEP) of a short laser pulse with a duration shorter
than 5fs. However, applications of gating technologies can cause decays of attosecond light
intensities and conditions of controlling CEP are too strict to be realized in experiments. Here,
we propose to generate an intense attoseocnd pulse by using two laser pulses, a normal one and
a chirped one, interacting with overdense plasmas. By tuning the initial phase and the linear
chirp parameters, the numbers of attoseocond pulses and intensities can be controlled .
References
[1] M. Yeung, S. Rykovanov, J. Bierbach, L. Li, E. Eckner, S. Kuschel, A. Woldegeorgis, C. Rödel, A. Sävert,
G. G. Paulus, M. Coughlan, B. Dromey, and M. Zepf, Nat. Photonics 11, 32-35 (2017).
[2] S. G. Rykovannov , M. Geissler , J. Meyer-ter-Vehn , and G. D. Tsakiris , New J. Phys. 10, 025025 (2008).
[3] Y. X. Zhang, B. Qiao, X. R. Xu, H. X. Chang, M. Y. Yu, C. L. Zhong, C. T. Zhou, S. P. Zhu, and X. T. He,
Phys. Plasmas 25, 023302 (2018).
