Visualization of corona discharge induced by UV (248 nm) pulses of a KrF excimer laser

Jerzy Mizeraczyk; Toshikazu Ohkubo; Seiji Kanazawa; Yukiharu Nomoto; Toshiyuki Kawasaki; Marek Kocik

doi:10.1117/12.405984

2 November 2000 Visualization of corona discharge induced by UV (248 nm) pulses of a KrF excimer laser

Jerzy Mizeraczyk, Toshikazu Ohkubo, Seiji Kanazawa, Yukiharu Nomoto, Toshiyuki Kawasaki, Marek Kocik

Proceedings Volume 4238, Laser Technology VI: Applications; (2000) https://doi.org/10.1117/12.405984
Event: Laser Technology VI, 1999, Szczecin, Poland

Abstract

A KrF excimer laser (248 nm) was used to induce DC corona discharge streamers in air between the electrodes of a needle-to-plane geometry. The UV laser beam pulses were transformed into the form of a laser sheet (1.5 mm thick and 20 mm-wide) that was positioned along the axis directed from the needle electrode to the plane electrode. The laser pulses were time-synchronized with the exposure of an ICCD camera that record images of the corona streamers induced by the laser sheet. The laser pulse energy flux (75 MW/cm²) crossing the gap was high enough to induce corona streamers with a reliability of 100% even at relatively low operating voltages (e.g., 15 kV) at which self-sustained streamers could not occur. Due to the full synchronization of the corona streamer onset, induced by the laser pulse and the exposure of the ICCD camera, 2-D visualization of the corona streamer evolution with a time resolution of 10 ns was possible. The recorded images made possible determining such features of the corona discharge streamer as its velocity (2.5 10⁵ m/s) and the diameters of the leader channel (200 micrometers ) and the leader streamers (100 micrometers ).

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Jerzy Mizeraczyk, Toshikazu Ohkubo, Seiji Kanazawa, Yukiharu Nomoto, Toshiyuki Kawasaki, and Marek Kocik "Visualization of corona discharge induced by UV (248 nm) pulses of a KrF excimer laser", Proc. SPIE 4238, Laser Technology VI: Applications, (2 November 2000); https://doi.org/10.1117/12.405984

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