Classical trajectories in polar-asymmetric laser fields: Synchronous THz and XUV emission

Abstract

Synchronous extreme ultraviolet (XUV) and single-cycle terahertz (THz) bursts are generated in argon plasma induced by intense two-color femtosecond laser pulses. Correlations between the intensity of the even and odd high-harmonics and the THz radiation are found by studying the phase-delay between the excitation pulses at 800 and 400 nm as well as the degree of polar asymmetry in the incident electric field. Experiments in both the weak- and strong- polar asymmetric regimes show remarkable agreement with a simple analytical model based on classical electron trajectories in an arbitrary synthetic electric field.

6 pages, 4 figures

References in corpus (5)

• Bright Coherent Ultrahigh Harmonics in the keV X-Ray Regime from Mid-Infrared Femtosecond Lasers
• Electron-energy bunching in laser-driven soft recollisions
• Medium propagation effects in high harmonic generation of Ar and N${}_2$
• Ticking terahertz wave generation in attoseconds
• Quantum mechanical approach to probing the birth of attosecond pulses using a two-color field