Spatially Resolved Electron Number Density Measurements Via Coherent Microwave Scattering

• DOI: 10.48550/arxiv.2405.04643
• Publication Date: 2024-05-07
• Authors: Nicholas Babusis; Adam Patel; Rokas Jutas; Zahra Manzoor; Mikhail N. Shneider; A. Pugžlys; Andrius Baltuška; Alexey Shashurin
• Keywords: Plasma Physics (physics.plasm-ph); 0103 physical sciences; FOS: Physical sciences; 0210 nano-technology; Physics - Plasma Physics

This paper reports on the use of coherent microwave scattering (CMS) for spatially resolved electron number density measurements elongated plasma structures induced at mid-IR femtosecond filamentation. The presented studies comprise one-dimensional mapping laser filaments via 3.9 um, 127.3 fs pulses output energies up to 15 mJ. axial and intensity were measured be invariant along entire filament length tested pulse 5-15 mJ (2x$10^{15}$ cm$^{-3}$ 30-40 TW/cm$^2$, respectively) which supports that clamping conditions achieved in experiments. proposed approach enables unprecedented, currently unavailable capabilities conduct direct, absolute, longitudinally precisely characterize associated with self-focusing clamping.