Abstract
Single attosecond pulse generation with polarization gating Bessel-Gauss beam in relatively strongly-ionized media is investigated. The results show that Bessel-Gauss beam has the ability to suppress the spatial plasma dispersion effects caused by high density of free electrons, thus the laser field can maintain its spatial profile through highly-ionized medium. This indicates the use of Bessel-Gauss beam has advantages over Gaussian beam in high harmonic generation under high ionization conditions. In our scheme, significant improvement of spatiotemporal properties of harmonics is achieved and an isolated attosecond pulse with high beam quality is filtered out using polarization gating.
Highlights
High-order harmonic generation (HHG) is a highly nonlinear process occurring in the interaction of intense laser fields with atoms and molecules
The physical mechanism of HHG process in single-atom level can be well understood by the three-step model [6, 7], i.e., an electron is ionized by tunnelling through the potential barrier suppressed by the laser field, it is driven by the laser field treated as a free electron, and it may return to the atomic core and emit a harmonic photon in the transition back to the ground state
We investigate high-order harmonic generation with polarization-gating BesselGauss beam, in a relatively high-ionized media of xenon
Summary
High-order harmonic generation (HHG) is a highly nonlinear process occurring in the interaction of intense laser fields with atoms and molecules. It has been widely studied for the past two decades for its potential of producing ultrashort attosecond pulses [1,2,3], and as shortwavelength light sources [4, 5]. Phase matching in the propagation plays an important role in HHG [22,23,24] When both the ionization probability and the atomic density are low, the fundamental laser field is not modified through the medium, which implies that macroscopic propagation effects on the driving field can be neglected. A short summary in Sec. 4 concludes this paper and potential applications of attosecond pulse with high beam quality are discussed
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