# Characterization of a laser filament-induced plasma in air at 10 kHz using optical emission spectroscopy Source: [Characterization of a laser filament-induced plasma in air at 10 kHz using optical emission spectroscopy]() Collection index: [llms.txt]() Data updated: 2025-10-25T08:12:55.239Z Authors: Malte C. Schroeder, Robin L\\"oscher, Nikita Bibinov, Ihor Korolov, Peter Awakowicz, Thomas Mussenbrock, Clara J. Saraceno Published: 2025-08-05T10:39:43.000Z ## Abstract The increasing availability of high-power Yb-based ultrafast laser-amplifier systems has opened the possibility of air filamentation at high repetition rates \>1 kHz. In this new regime, accumulation effects cannot be ruled out, therefore, characterizing the plasma parameters and afterglow plasma-chemical kinetics becomes increasingly relevant. In this work, we use optical emission spectroscopy to measure nanosecond dynamics of gas temperature and electron temperature, species-specific decay times, and electron density of an atmospheric air laser filament produced by high average power femtosecond laser at a high repetition rate of 10 kHz. The molecular excitation mechanisms behind the nitrogen photoemissions are derived from vibrational distributions and temporal behavior of the studied emission bands. The presented diagnostic technique offers a complementary but more holistic measurement approach to optical probe schemes to characterize the laser-filament-induced plasma wake for high repetition rate filaments. ## Recorded benchmark results A research result applies to its stated dataset, split, metric and evaluation configuration. Compare like-for-like settings, preserve the metric's unit and direction, and distinguish paper-reported results from independent reproduction. The best result recorded here is not a claim of exhaustive, current global coverage. ## Original sources and implementation [Original paper]() [PDF]()