Perspectives for the Generation of Intense Isolated Attosecond Pulses at Ultra-high Laser Intensities

Abstract

Attosecond pulses result from the Fourier synthesis of the higher frequency part of the harmonic spectra, emitted by atoms, ions and molecules interacting with strong lasers. Therefore, their characteristics (central wavelength, width and dispersion) depend on the particular relation of the spectral phase and amplitudes between successive high harmonics. In this chapter we will expose the particular features of the harmonic spectrum generated with intensities well above saturation where the harmonic spectra is expected to be degraded by the fast ionization of the atoms. However, we shall see how for the case of laser pulses with non-adiabatic turn-on interacting with a single atom, the harmonic efficiency is recovered for sufficiently high intensities. Our study combines classical analysis and full quantum description via numerical integration of 3-Dimensional Time Dependent Schrödinger Equation. Results presented here reveals that non-adiabatic pulses with intensities well above the saturation threshold open the door for a new pathway for XUV coherent light generation through high-order harmonic generation providing a potential tool to obtain intense isolated attosecond pulses.

Keywords

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