Preprint Article Version 1 This version is not peer-reviewed

Time-Resolved Imaging of Femtosecond Laser-Induced Plasma Expansion in a Nitrogen Microjet

Version 1 : Received: 13 January 2022 / Approved: 14 January 2022 / Online: 14 January 2022 (11:24:56 CET)

How to cite: Ciriolo, A.G.; Martinez Vazquez, R.; Crippa, G.; Devetta, M.; Frezzotti, A.; Comelli, D.; Valentini, G.; Osellame, R.; Vozzi, C.; Stagira, S. Time-Resolved Imaging of Femtosecond Laser-Induced Plasma Expansion in a Nitrogen Microjet. Preprints 2022, 2022010204 (doi: 10.20944/preprints202201.0204.v1). Ciriolo, A.G.; Martinez Vazquez, R.; Crippa, G.; Devetta, M.; Frezzotti, A.; Comelli, D.; Valentini, G.; Osellame, R.; Vozzi, C.; Stagira, S. Time-Resolved Imaging of Femtosecond Laser-Induced Plasma Expansion in a Nitrogen Microjet. Preprints 2022, 2022010204 (doi: 10.20944/preprints202201.0204.v1).

Abstract

We report on the study of ultrafast laser-induced plasma expansion dynamics in a gas microjet. To this purpose, we focused femtosecond laser pulses on a nitrogen jet produced through a homemade De Laval micronozzle. The laser excitation leads to plasma excitation with a characteristic spectral line emission at 391 nm. By following the emitted signal with a detection system based on an Intensified Charge-Coupled Device (ICCD) we captured the two-dimensional spatial evolution of the photo-excited nitrogen ions with a temporal resolution on the nanosecond time scale. We fabricated the micronozzle on fused silica substrate by femtosecond laser micromachining. This technique enables high accuracy and three-dimensional capabilities, thus providing an ideal platform for developing glass-based microfluidic structures for application to plasma physics and ultrafast spectroscopy.

Keywords

De Laval nozzle; femtosecond laser micromachining; ultrafast laser sources.

Subject

PHYSICAL SCIENCES, Fluids & Plasmas

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