Current measurements in plasma produced by the train of 10.6-um subnanosecond laser pulses

Victor V. Apollonov; K. Kh. Kazakov; N. V. Pletnyev; Vladimir R. Sorochenko

doi:10.1117/12.375110

11 January 2000 Current measurements in plasma produced by the train of 10.6-um subnanosecond laser pulses

Victor V. Apollonov, K. Kh. Kazakov, N. V. Pletnyev, Vladimir R. Sorochenko

Proceedings Volume 3886, High-Power Lasers in Energy Engineering; (2000) https://doi.org/10.1117/12.375110
Event: Advanced High-Power Lasers and Applications, 1999, Osaka, Japan

Abstract

Results of current probe measurements for a plasma produced by the train of approximately 200 ps 10.6 micrometers laser pulses are reported. The train of pulses was obtained as a result of regenerative amplification of approximately 100 ps laser pulse in a 5 cm aperture 6 atm TE-CO₂ laser. Experiments were carried out for Wo and Al targets dispersed in vacuum, two values of the interpulses separation in the train (Delta) T equals 9.3 and 29 ns and wide range of energy density on the target, corresponding to peak intensities of single pulses I_p equals 1 divided by 300 GW/cm². Experiments had shown large difference of temporal structure of current signal with Wo and Al targets due to the considerable different in melting temperatures of these materials as well as radiation loses of laser plasma. We detected large ratio of current signal amplitudes for targets irradiation by the pulse train or gain switched pulse generated in TE-CO₂ laser without injection of a short pulse. Results of these measurements are compared with those earlier obtained for nanosecond pulse train.

Citation Download Citation

Victor V. Apollonov, K. Kh. Kazakov, N. V. Pletnyev, and Vladimir R. Sorochenko "Current measurements in plasma produced by the train of 10.6-um subnanosecond laser pulses", Proc. SPIE 3886, High-Power Lasers in Energy Engineering, (11 January 2000); https://doi.org/10.1117/12.375110

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