Tunable Circularly Polarized Terahertz Radiation from Magnetized Gas Plasma

Abstract

It is shown, by simulation and theory, that circularly or elliptically polarized terahertz radiation can be generated when a static magnetic (B) field is imposed on a gas target along the propagation direction of a two-color laser driver. The radiation frequency is determined by $\sqrt{{\omega }_p^2+{\omega }_c^2/4}+{\omega }_c/2$, where ${\omega }_p$ is the plasma frequency and ${\omega }_c$ is the electron cyclotron frequency. With the increase of the B field, the radiation changes from a single-cycle broadband waveform to a continuous narrow-band emission. In high-B-field cases, the radiation strength is proportional to ${\omega }_p^2/{\omega }_c$. The B field provides a tunability in the radiation frequency, spectrum width, and field strength.

6 pages, 5 figures

References in corpus (3)

• Interband impact ionization and nonlinear absorption of terahertz radiations in semiconductor heterostructures
• Integrated simulation approach for laser-driven fast ignition
• Laser-driven platform for generation and characterization of strong quasi-static magnetic fields

Cited by in corpus (2)

• Observation of Terahertz Radiation via the Two-Color Laser Scheme with Uncommon Frequency Ratios
• Extreme case of Faraday effect: magnetic splitting of ultrashort laser pulses in plasmas