Ciriolo, A.G.; Martínez Vázquez, 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. Appl. Sci.2022, 12, 1978.
Ciriolo, A.G.; Martínez Vázquez, 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. Appl. Sci. 2022, 12, 1978.
Ciriolo, A.G.; Martínez Vázquez, 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. Appl. Sci.2022, 12, 1978.
Ciriolo, A.G.; Martínez Vázquez, 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. Appl. Sci. 2022, 12, 1978.
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 and Plasmas Physics
Copyright:
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