Train of ultrashort UV pulses produces plasma channel

Ионин, А. А.; Kudryashov, S. I.; Левченко, А. В.; Селезнев, Л. В.; Shutov, A. M.; Sinitsyn, D. V.; Smetanin, I. V.; Sunchugasheva, E. S.; Ustinovsky, N. N.; Зворыкин, В. Д.

doi:10.1117/2.1201211.004550

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“…In recent experiments [34] with high-voltage (HV) discharge triggering at a constant voltage across the discharge gap we used a circuit with two 0.1 mF high-voltage capacitors, which were charged to a voltage up to U = 140 kV. This voltage was applied to two spherical electrodes with a radius of 1.5 cm, located 8 cm from one another (see figure 9(a)).…”

Section: Discharge Triggering With Amplitude Modulated Beamsmentioning

confidence: 99%

Formation of plasma channels in air under filamentation of focused ultrashort laser pulses

2015

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The formation of plasma channels in air under filamentation of focused ultrashort laser pulses was experimentally and theoretically studied together with theoreticians of the Moscow State University and the Institute of Atmospheric Optics. The influence of various characteristics of ultrashort laser pulses on these plasma channels is discussed. Plasma channels formed under filamentation of focused laser beams with a wavefront distorted by spherical aberration (introduced by adaptive optics) and by astigmatism, with cross-section spatially formed by various diaphragms and with different UV and IR wavelengths, were experimentally and numerically studied. The influence of plasma channels created by a filament of a focused UV or IR femtosecond laser pulse (λ = 248 nm or 740 nm) on characteristics of other plasma channels formed by a femtosecond pulse at the same wavelength following the first one with varied nanosecond time delay was also experimentally studied. An application of plasma channels formed due to the filamentation of focused UV ultrashort laser pulses including a train of such pulses and a combination of ultrashort and long (~100 ns) laser pulses for triggering and guiding long (~1 m) electric discharges is discussed.

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Section: Discharge Triggering With Amplitude Modulated Beamsmentioning

confidence: 99%