Journal Article

Tracing Air-Breakdown Plasma Characteristics from Single-Color Filament Terahertz Spectra

Ushakov, A. A., Rizaev, G. E., Koribut, A. V., Savel’ev, A. B., Mokrousova, D. V., Panov, N. A., Kosareva, O. G., Nikolaeva, I. A., Shipilo, D. E., Ionin, A. A., Shkurinov, A. P., Seleznev, L. V., Mityagin, Yu. A., Savinov, S. A.

2020

Overview

In this paper, we measure broadband terahertz spectra from a single 744-nm filament produced in tight, medium, and loose geometrical focusing conditions. Terahertz spectra are measured using interferometer coupled to a helium-cooled bolometer avoiding any cutoff frequencies. Based on THz spectrum maximum position and spectral width, we estimate electron-heavy particle (neutrals and ions) collision rate. Numerical simulations are performed using the state-of-the-art model of unidirectional femtosecond pulse propagation and convergence/divergence of optical radiation at large angles.

• Publisher: Springer US,Springer Nature B.V
• Subject: Angles (geometry) / Bolometers / Broadband / Classical Electrodynamics / Collision rates / Computer simulation / Divergence / Electrical Engineering / Electronics and Microelectronics / Engineering / Femtosecond pulses / Geometry / Instrumentation / Lasers / Mathematical models / Measurement techniques / Optical radiation / Physics / Plasma / Pulse propagation / Radiation / Simulation / Spectra / Spectrum analysis / Terahertz frequencies