Probe investigations of close-to-surface plasma, produced by CO2 laser nanosecond pulse train

Vladimir R. Sorochenko; Victor V. Apollonov; Vitali I. Konov; Petr I. Nikitin; Alexander M. Prokhorov; Yu. A. Shakir

doi:10.1117/12.18511

1 June 1990 Probe investigations of close-to-surface plasma, produced by CO₂ laser nanosecond pulse train

Vladimir R. Sorochenko, Victor V. Apollonov, Vitali I. Konov, Petr I. Nikitin, Alexander M. Prokhorov, Yu. A. Shakir

Proceedings Volume 1225, High-Power Gas Lasers; (1990) https://doi.org/10.1117/12.18511
Event: OE/LASE '90, 1990, Los Angeles, CA, United States

Abstract

Investigations of currents in close-to surface plasma, produced by CO₂- laser radiation of different temporal structure have been carried out. The character of evolution of registered currents temporal structure at growing energy density was different when the target was irradiated in air and in vacuum by the train of short (τ= 2.5 ns ) pulses. Experiments in vacuum have revealed that the transit from smooth single mode pulse to the nanosecond pulse train of the same total energy was followed by a considerable decrease in plasma formation energy thresholds and by the increase of amplitudes of currents induced by plasma. The current pulses from the target were registered after finishing the laser irradiation; their appearance was probably connected with cumulation effects, caused by the ring form of the irradiated area.

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Vladimir R. Sorochenko, Victor V. Apollonov, Vitali I. Konov, Petr I. Nikitin, Alexander M. Prokhorov, and Yu. A. Shakir "Probe investigations of close-to-surface plasma, produced by CO₂ laser nanosecond pulse train", Proc. SPIE 1225, High-Power Gas Lasers, (1 June 1990); https://doi.org/10.1117/12.18511

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