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• W3207250641 abstract "We investigated the filamentation in air of 7 ps laser pulses of up to 200 mJ energy from a 1.03 μm-wavelength Yb:YAG laser at repetition rates up to <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline> <mml:mi>f</mml:mi> <mml:mo>=</mml:mo> <mml:mrow class=MJX-TeXAtom-ORD> <mml:mn>1</mml:mn> </mml:mrow> <mml:mspace width=thickmathspace /> <mml:mrow class=MJX-TeXAtom-ORD> <mml:mi mathvariant=normal>k</mml:mi> <mml:mi mathvariant=normal>H</mml:mi> <mml:mi mathvariant=normal>z</mml:mi> </mml:mrow> </mml:math> . Interferograms of the wake generated show that while pulses in a train of repetition rate <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline> <mml:mi>f</mml:mi> <mml:mo>=</mml:mo> <mml:mrow class=MJX-TeXAtom-ORD> <mml:mn>0.1</mml:mn> </mml:mrow> <mml:mspace width=thickmathspace /> <mml:mrow class=MJX-TeXAtom-ORD> <mml:mi mathvariant=normal>k</mml:mi> <mml:mi mathvariant=normal>H</mml:mi> <mml:mi mathvariant=normal>z</mml:mi> </mml:mrow> </mml:math> encounter a nearly unperturbed environment, at <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline> <mml:mi>f</mml:mi> <mml:mo>=</mml:mo> <mml:mrow class=MJX-TeXAtom-ORD> <mml:mn>1</mml:mn> </mml:mrow> <mml:mspace width=thickmathspace /> <mml:mrow class=MJX-TeXAtom-ORD> <mml:mi mathvariant=normal>k</mml:mi> <mml:mi mathvariant=normal>H</mml:mi> <mml:mi mathvariant=normal>z</mml:mi> </mml:mrow> </mml:math> , a channel with an axial air density hole of <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline> <mml:mrow class=MJX-TeXAtom-ORD> <mml:mo>∼<!-- ∼ --></mml:mo> </mml:mrow> <mml:mn>20</mml:mn> <mml:mi mathvariant=normal>%<!-- % --></mml:mi> </mml:math> is generated and maintained at all times by the cumulative effect of preceding laser pulses. Measurements at <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline> <mml:mi>f</mml:mi> <mml:mo>=</mml:mo> <mml:mrow class=MJX-TeXAtom-ORD> <mml:mn>1</mml:mn> </mml:mrow> <mml:mspace width=thickmathspace /> <mml:mrow class=MJX-TeXAtom-ORD> <mml:mi mathvariant=normal>k</mml:mi> <mml:mi mathvariant=normal>H</mml:mi> <mml:mi mathvariant=normal>z</mml:mi> </mml:mrow> </mml:math> show that the energy deposited decreases proportional to the air channel density depletion, becoming more pronounced as the repetition rate and pulse energy increase. Numerical simulations indicate that contrary to filaments generated by shorter duration pulses, the electron avalanche is the dominant energy loss mechanism during filamentation with 7 ps pulses. The results are of interest for the atmospheric propagation of joule-level picosecond pulses from Yb:YAG lasers, of which average powers now surpass 1 kW, and for channeling other directed energy beams." @default.
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• W3207250641 date "2021-10-28" @default.
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• W3207250641 title "Wake dynamics of air filaments generated by high-energy picosecond laser pulses at 1 kHz repetition rate" @default.
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