Boosting terahertz-radiation power with two-color circularly polarized midinfrared laser pulses

Abstract

A way to considerably enhance terahertz radiation, emitted in the interaction of intense mid-infrared laser pulses with atomic gases, in both the total energy and the electric-field amplitude is suggested. The scheme is based on the application of a two-color field consisting of a strong circularly polarized mid-infrared pulse with wavelengths of $1.6÷4\mu \mathrm{m}$ and its linearly or circularly polarized second harmonic of lower intensity. By combining the strong-field approximation for the ionization of a single atom with particle-in-cell simulations of the collective dynamics of the generated plasma it is shown that the application of such two-color circularly polarized laser pulses may lead to an order-of-magnitude increase in the energy emitted in the terahertz frequency domain as well as in a considerable enhancement in the maximal electric field of the terahertz pulse. Our results support recently reported experimental and numerical findings.

arXiv comment9 pages, 6 figures

References in corpus (6)

• Single-cycle THz pulses with amplitudes exceeding 1 MV/cm generated by optical rectification in LiNbO3
• Molecular Orientation by Intense Single Cycle THz Pulses
• The Higgs Mode in Disordered Superconductors Close to a Quantum Phase Transition
• Photoelectron spectra with Qprop and t-SURFF
• Extreme THz fields from two-color filamentation of mid-infrared laser pulses
• THz generation by optical Cherenkov emission from ionizing two-color laser pulses

Cited by in corpus (4)

• QPROP with faster calculation of photoelectron spectra
• Terahertz pulse generation by two-color laser fields with circular polarization
• THz generation from relativistic plasmas driven by near- to far-infrared laser pulses
• All-optical attoclock for imaging tunnelling wavepackets