One-dimensional mapping of femtosecond laser filaments using coherent microwave scattering

Babusis, Nicholas; Patel, Adam; Jutas, Rokas; Manzoor, Zahra; Shneider, Mikhail N.; Pugzlys, Audrius; Baltuska, Andrius; Shashurin, Alexey

doi:10.1103/PhysRevE.110.055206

One-dimensional mapping of femtosecond laser filaments using coherent microwave scattering

Journal Article · Thu Nov 21 00:00:00 EST 2024 · Physical Review. E

DOI:https://doi.org/10.1103/PhysRevE.110.055206· OSTI ID:3008704

^[1]; ^[1]; ^[2]; Manzoor, Zahra ^[1]; Shneider, Mikhail N. ^[3]; Pugzlys, Audrius ^[2]; Baltuska, Andrius ^[2]; ^[1]

Purdue Univ., West Lafayette, IN (United States)
Vienna Univ. of Technology (Austria)
Princeton Univ., NJ (United States)

Here, this paper reports on the use of coherent microwave scattering (CMS) for spatially resolved electron number density measurements of elongated plasma structures induced at mid-IR femtosecond filamentation in air. The presented studies comprise one-dimensional mapping of laser filaments induced via 3.9 µm, 127.3 fs laser pulses at output energies up to 15 mJ. The axial electron number density was measured to be invariant (about 2 × 10¹⁵ c⁢m⁻³) along the entire filament length and for all tested laser pulse energies 5–15 mJ, and the corresponding laser intensity in the middle portion of the filament was estimated to be nearly constant for 5–15 mJ pulse energies (about 30−40 TW/c⁢m²). These findings support that intensity clamping conditions were achieved in the experiments. The proposed approach enables capabilities that are currently unavailable to perform absolute and longitudinally resolved measurements of electron number density in laser filaments and to precisely characterize conditions associated with self-focusing and intensity clamping.

View Accepted Manuscript (DOE)

Research Organization:: Purdue Univ., West Lafayette, IN (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Fusion Energy Sciences (FES)

Grant/Contract Number:: SC0023209

OSTI ID:: 3008704

Report Number(s):: DOE; SC0023209

Journal Information:: Physical Review. E, Journal Name: Physical Review. E Journal Issue: 5 Vol. 110; ISSN 2470-0053; ISSN 2470-0045

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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