https://doi.org/10.1140/epjd/s10053-021-00302-5
Regular Article – Ultraintense and Ultrashort Laser Fields
Chirp duration effect on high-order harmonic spectra
1
Laboratory of Modern Physics, Liaoning University of Technology, 121000, Jinzhou, China
2
Department of Pathophysiology, Basic Medical College of Zhengzhou University, 450001, Zhengzhou, China
Received:
7
September
2021
Accepted:
2
November
2021
Published online:
21
November
2021
Chirp duration effect on high-order harmonic spectra has been theoretically studied. The results show that (i) as the chirp duration increases, both the harmonic cutoff and the harmonic intensity are enhanced. Meanwhile, at some given chirp duration, the maximum harmonic cutoff and harmonic intensity can be found (i.e., 30 fs in this paper). (ii) For the cases of the shorter and longer chirp duration, the variations of the harmonic cutoff and the harmonic intensity show a larger and smaller trend as the chirp delay changes, respectively. (iii) Furthermore, with the introduction of the two-color field scheme, the harmonic spectrum from the shorter chirp duration can produce a stronger harmonic intensity, while the changes of the harmonic cutoff and the harmonic intensity are very small for the longer chirp duration two-color pulse case. That is to say, the shorter chirp duration is beneficial to the combined field scheme, while the longer chirp duration is suitable for the single-color field scheme. (iv) Finally, three isolated attosecond pulses of 84 as, 88 as and 25 as can be generated when using the shorter and longer chirp duration cases, respectively.
© The Author(s), under exclusive licence to EDP Sciences, SIF and Springer-Verlag GmbH Germany, part of Springer Nature 2021
