Role of Excited States In High-order Harmonic Generation

Abstract

We investigate the role of excited states in High-order Harmonic Generation by studying the spectral, spatial and temporal characteristics of the radiation produced near the ionization threshold of argon by few-cycle laser pulses. We show that the population of excited states can lead either to direct XUV emission through Free Induction Decay or to the generation of high-order harmonics through ionization from these states and recombination to the ground state. By using the attosecond lighthouse technique, we demonstrate that the high-harmonic emission from excited states is temporally delayed by a few femtoseconds compared to the usual harmonics, leading to a strong nonadiabatic spectral redshift.

Accepted at Physical Review Letters

References in corpus (3)

• Strong-Field Perspective on High-Harmonic Radiation from Bulk Solids
• Multi-channel Electronic and Vibrational Dynamics in Polyatomic High-order Harmonic Generation
• Enhancing narrowband high order harmonic generation by Fano resonances

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