期刊
PHOTONICS
卷 10, 期 10, 页码 -出版社
MDPI
DOI: 10.3390/photonics10101122
关键词
attosecond physics; high-harmonic generation; intense laser field; attosecond pulses; isolated attosecond pulse; phase matching; gating techniques; propagation; time-dependent Schrodinger equation
类别
In this study, we investigate the production of an isolated attosecond pulse through phase-matching gating technique and intense laser pulses. We study the XUV energy as a function of propagation distance and find the upper limit of the fundamental pulse duration for attosecond pulse generation.
We investigate the production of an isolated attosecond pulse (IAP) via the phase-matching gating of high-harmonic generation with intense laser pulses. Our study is based on the integration of the propagation equation for the fundamental and generated fields with nonlinear polarisation found via the numerical solution of the time-dependent Schrodinger equation. We study the XUV energy as a function of the propagation distance (or the medium density) and find that the onset of the IAP production corresponds to the change from linear to quadratic dependence of this energy on the propagation distance (or density). Finally, we show that the upper limit of the fundamental pulse duration for which IAP generation is feasible is defined by the temporal spreading of the fundamental pulse during the propagation. This nonlinear spreading is defined by the difference in the group velocities for the neutral and photoionised medium.
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