Terahertz generation in dual-color laser: continuum electron in strong-field single-atom ionization

Abstract

The terahertz (THz) generation in a dual-color field was investigated experimentally by precisely controlling the relative time delay $\tau$ and polarization $\theta$ of dual-color lasers, where the accompanying third-harmonic generation (THG) is employed to determine $\tau$ up to the sub-wavelength accuracy. An anticorrelation of the yields between THz and THG with $\tau$ was displayed. Compared with the theoretical simulations, the experimental results reveal that the continuum-continuum transitions of the released electron after single-atom ionization are the dominating mechanism for THz generation, which is opposite to the high-harmonic generation (HHG) based on the recollision mechanism, or the radiation induced by perturbative bound-bound transitions.

References in corpus (6)

• Observation of Terahertz Radiation via the Two-Color Laser Scheme with Uncommon Frequency Ratios
• Ticking terahertz wave generation in attoseconds
• Spectral dynamics of THz pulses generated by two-color laser filaments in air: The role of Kerr nonlinearities and pump wavelength
• On the Saturation of the Nonlinear Refractive Index in Atomic Gases
• CEP-stable Tunable THz-Emission Originating from Laser-Waveform-Controlled Sub-Cycle Plasma-Electron Bursts
• Theoretical study of terahertz generation from atoms and aligned molecules driven by two-color laser fields

Cited by in corpus (6)

• All-optical attoclock for imaging tunnelling wavepackets
• Intensity-surged and Bandwidth-extended Terahertz Radiation in Two-foci Cascading Plasmas
• High order Brunel harmonics and supercontinuum formed by a weak optical pump in presence of a strong terahertz field
• Terahertz field induced near-cutoff even-order harmonics in femtosecond laser
• Coulomb potential determining terahertz polarization in two-color laser field
• Correspondence between classical and quantum resonances