Open AccessOptimization of attosecond pulses from the interaction of ultrarelativistic laser with overdense plasma
Author(s) -
Luo Mu-Hua,
Qiuju Zhang,
Chunyan Yan
Publication year - 2010
Publication title -
wuli xuebao
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.199
H-Index - 47
ISSN - 1000-3290
DOI - 10.7498/aps.59.8559
Subject(s) - attosecond , physics , plasma , laser , pulse (music) , atomic physics , electron , harmonics , energy conversion efficiency , dimensionless quantity , optics , ultrashort pulse , quantum mechanics , optoelectronics , voltage , detector
Using one-dimensional particle-in-cell simulations, the generation of attosecond pulses is studied due to the interaction of a short ultrarelativistic laser pulse with overdense plasma. According to the ultrarelativistic similarity theory, we analyze the motion of the electrons and the generation of high-order harmonics. We find that when the plasma density is constant and the dimensionless similarity parameter S decreases, the conversion efficiency of attosecond pulses first increases and then decreases. So we can choose a laser pulse with an appropriate intensity to obtain an attosecond pulse with a high conversion efficiency. Furthermore, when S is fixed, with the increase of the plasma density, the conversion efficiency of attosecond pulses shows an upward tendency. This implies that we can obtain a higher attosecond pulse when a laser with an appropriate intensity is incident on a denser plasma.