Optimal laser-pulse energy partitioning for air ionization

Schubert, Elise; Brisset, Jean-Gabriel; Matthews, Mary; Courjaud, Antoine; Kasparian, Jérôme; Wolf, Jean‐Pierre

doi:10.1103/physreva.94.033824

Cited by 12 publications

(16 citation statements)

References 39 publications

(63 reference statements)

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“…More ionization simultaneously implies more free charges and more energy deposition, hence a lower air density, and finally less efficient attachment to neutral molecules and therefore a longer plasma lifetime. The plasma evolution model, described in [28] confirms this interpretation. Indeed, simulations show that for picosecond pulses at 1030 nm the tunnel ionization term widely dominates over the multiphoton ionization, described by the Perelomov-Popov-Terent'ev (PPT) model.…”

Section: Discussionsupporting

confidence: 64%

“…Another approach consists in re-detaching and/or re-heating the free electrons by subsequent laser pulses. On one hand, multiple ultrashort pulses [28,29,30] increased the free electron lifetime over a duration similar to the pulse train.…”

Section: Introductionmentioning

confidence: 99%

“…The black solid line serves as eye guiding feature. The temporal evolution of the electron simulated with the model described in[28] is shown in blue. (a) Input laser energy of 50 mJ at 1030 nm (128 discharges in total).…”

mentioning

confidence: 99%

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HV discharges triggered by dual- and triple-frequency laser filaments

Produit¹,

Walch²,

Schimmel³

et al. 2019

Opt. Express

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We study the use of frequency upconversion schemes of near-IR picosecond laser pulses and compare their ability to guide and trigger electric discharges through filamentation in air. Upconversion, such as Second Harmonic Generation, is favorable for triggering electric discharges for given amount of available laser energy, even taking into account the losses inherent to frequency conversion. We focus on the practical question of optimizing the use of energy from a given available laser system and the potential advantage to use frequency conversion schemes.

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Section: Discussionsupporting

confidence: 64%

Section: Introductionmentioning

confidence: 99%

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HV discharges triggered by dual- and triple-frequency laser filaments

Produit¹,

Walch²,

Schimmel³

et al. 2019

Opt. Express

Self Cite

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“…The subsequent evolution of the charges relied on the plasma model of [44]. The results are displayed in Fig.…”

Section: Comparison With a Filament Propagation Modelmentioning

confidence: 99%

Linearity of charge measurement in laser filaments

et al. 2017

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We evaluate the linearity of three electric measurement techniques of the initial electron density in laser filaments by comparing their results for a pair of filaments and for the sum of each individual filament. The conductivity measured between two plane electrodes in a longitudinal configuration is linear within 2 % provided the electric field is kept below 100 kV/m. Furthermore, simulations show that the signal behaves like the amount of generated free electrons. The slow ionic current measured with plane electrodes in a parallel configuration is representative of the ionic charge available in the filament, after several μs, when the free electrons have recombined. It is linear within 2 % with the amount of ions and is insensitive to misalignment. Finally, the fast polarization signal in the same configuration deviates from linearity by up to 80 % and can only be considered as a semi-qualitative indication of the presence of charges, e.g., to characterize the filament length.

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“…The lifetime of the plasma is in the range of nanoseconds to tens of nanoseconds for the free electrons [25] and in the microsecond range for the ions. The speed of the guided discharge propagation amounts to -10 m s 5 1 for a leader regime in gaps or 3-7 m [13], and -10 m s 6 1 in a streamer regime for a shorter gap of 2 m [26].…”

Section: Introductionmentioning

confidence: 99%

HV discharge acceleration by sequences of UV laser filaments with visible and near-infrared pulses

et al. 2017

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We investigate the triggering and guiding of DC high-voltage discharges over a distance of 37 cm by filaments produced by ultraviolet (266 nm) laser pulses of 200 ps duration. The latter reduce the breakdown electric field by half and allow up to 80% discharge probability in an electric field of 920 kV m . This high efficiency is not further increased by adding nanosecond pulses in the Joule range at 532 and at 1064 nm. However, the latter statistically increases the guiding length, thereby accelerating the discharge by a factor of 2. This effect is due both to photodetachment and to the heating of the plasma channel, that increases the efficiency of avalanche ionization and reduces electron attachment and recombination.

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Optimal laser-pulse energy partitioning for air ionization

Cited by 12 publications

References 39 publications

HV discharges triggered by dual- and triple-frequency laser filaments

HV discharges triggered by dual- and triple-frequency laser filaments

Linearity of charge measurement in laser filaments

HV discharge acceleration by sequences of UV laser filaments with visible and near-infrared pulses

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