High order Brunel harmonics and supercontinuum formed by a weak optical pump in presence of a strong terahertz field
arXiv:2105.04627 · doi:10.1103/PhysRevA.106.013115
Abstract
Brunel harmonics appear in the optical response of an atom in process of laser-induced ionization, when the electron leaves the atom and is accelerated in the strong optical field. In contrast to recollision-based harmonics, the Brunel mechanism does not require the electron returning to the core. Here we show that in the presence of a strong ionizing terahertz (THz) field, even a weak driving field at the optical frequencies allow for generating Brunel harmonics effectively. The strong ionizing THz pump suppresses recollisions, making Brunel dominant in a wide spectral range. High-order Brunel harmonics may form a coherent carrier-envelope-phase insensitive supercontinuum, compressible into an isolated pulse with the duration down to 100 attoseconds.
References in corpus (14)
- Sub-cycle control of terahertz high-harmonic generation by dynamical Bloch oscillations
- Terahertz-driven linear electron acceleration
- Tailoring THz radiation by controlling tunnel photoionization events in gases
- Single attosecond pulse from terahertz-assisted high-order harmonic generation
- Spectral dynamics of THz pulses generated by two-color laser filaments in air: The role of Kerr nonlinearities and pump wavelength
- CEP-stable Tunable THz-Emission Originating from Laser-Waveform-Controlled Sub-Cycle Plasma-Electron Bursts
- Generation of terahertz radiation from ionizing two-color laser pulses in Ar filled metallic hollow waveguides
- Energies and wave functions for a soft-core Coulomb potential
- Terahertz and higher-order Brunel harmonics: from tunnel to multiphoton ionization regime in tailored fields
- Giant self-induced transparency of intense few-cycle terahertz pulses in n-doped silicon
- High harmonic interferometry of the Lorentz force in strong mid-infrared laser fields
- Terahertz generation in dual-color laser: continuum electron in strong-field single-atom ionization
- Nonlinear Transfer of Intense Few Cycle Terahertz Pulse Through Opaque n-doped Si
- Combined action of the bound-electron nonlinearity and the tunnel-ionization current in low-order harmonic generation in noble gases