Abstract
We present the isolation of single attosecond pulses for multi-cycle and few-cycle laser pulses from high harmonic generation in overdense plasmas, calculated with particle-in-cell simulations. By the combination of two laser pulses of equal amplitude and a small frequency shift between them, we demonstrate that it is possible to shorten the region in which the laser pulse is most intense, therefore restricting the generation of high harmonic orders in the form of attosecond pulses to a narrower time window. The creation of this window is achieved due to the combination of the laser pulse envelope and the slow oscillating wave obtained from the coherent sum of the two pulses. A parametric scan, performed with particle-in-cell simulations, reveals how the pulse isolation behaves for different input laser pulse lengths and which are the optimal frequency shifts between the two laser pulses in each case, giving the conditions for having a good isolation of an attosecond pulse when working with laser-plasma interaction in overdense targets.
Highlights
Attoscience is a very interesting field that has gained attention over the past decades
In gas media high harmonic generation (HHG) is generated due to a nonlinear quantum process, in which the laser pulse interacts with the atoms and molecules in the medium and the harmonic spectrum is carried in the transmitted field [1,2,3, 11]
It has been proven that the combination of two laser pulses of equal amplitude and envelope, with a properly tuned small frequency shift between them, creates a beating pattern that yields to the isolation of a single attosecond pulse once high harmonic orders have been filtered in the reflected field
Summary
Attoscience is a very interesting field that has gained attention over the past decades. Lewenstein, “Attosecond pulse trains using high order harmonics,” Phys. B. Gaarde, “Attosecond pulse trains generated using two color laser fields,” Phys.
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