Laser-guided discharges in long gaps

Shindo, Takatoshi; Miki, Megumu; Aihara, Yoshinori; Wada, Atsushi

doi:10.1109/61.248316

Cited by 12 publications

(3 citation statements)

References 9 publications

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“…These pioneering demonstrations initiated many investigations from scientists around the world as for example the remarkable work performed at the Electrical Power Research Center in Japan in the 1990s. Laboratory experiments with high energy nanosecond CO 2 lasers (Miki et al 1993, Shindo et al 1993a, Shindo et al 1993b and KrF UV lasers (Miki et al 1996b) allowed to guide megavolt-class discharges up to 2 m-long gaps. However, the nanosecond laser pulses yielded a series of localized plasma balls, rather than an extended conductive channel: The high electron density plasma, produced by the leading edge of the mid-IR pulse and avalanche ionization, was opaque for its trailing part, which hindered adequate further propagation.…”

Section: Laser Induced High-voltage Discharge Triggering and Guidingmentioning

confidence: 99%

Short-pulse lasers for weather control

Wolf

2017

Rep. Prog. Phys.

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Filamentation of ultra-short TW-class lasers recently opened new perspectives in atmospheric research. Laser filaments are self-sustained light structures of 0.1-1 mm in diameter, spanning over hundreds of meters in length, and producing a low density plasma (10-10 cm) along their path. They stem from the dynamic balance between Kerr self-focusing and defocusing by the self-generated plasma and/or non-linear polarization saturation. While non-linearly propagating in air, these filamentary structures produce a coherent supercontinuum (from 230 nm to 4 µm, for a 800 nm laser wavelength) by self-phase modulation (SPM), which can be used for remote 3D-monitoring of atmospheric components by Lidar (Light Detection and Ranging). However, due to their high intensity (10-10 W cm), they also modify the chemical composition of the air via photo-ionization and photo-dissociation of the molecules and aerosols present in the laser path. These unique properties were recently exploited for investigating the capability of modulating some key atmospheric processes, like lightning from thunderclouds, water vapor condensation, fog formation and dissipation, and light scattering (albedo) from high altitude clouds for radiative forcing management. Here we review recent spectacular advances in this context, achieved both in the laboratory and in the field, reveal their underlying mechanisms, and discuss the applicability of using these new non-linear photonic catalysts for real scale weather control.

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Section: Laser Induced High-voltage Discharge Triggering and Guidingmentioning

confidence: 99%

Short-pulse lasers for weather control

Wolf

2017

Rep. Prog. Phys.

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“…Unfortunately, we have only seen reports of relatively short paths (on the order of centimeters), which would, at best, only be good for applications much smaller than currently conceivable. The IR-induced formation of a series of plasma beads, however, has been observed over several meters (Shindo et al) 37 , and even this "dotted" line may serve as an approximation to generating our required "extended hot path".…”

Section: Electromagnetic Heating/propagation Through Airmentioning

confidence: 97%

Energy Deposition II: Physical Mechanisms Underlying Techniques to Achieve High-Speed Flow Control

Kremeyer¹

2015

20th AIAA International Space Planes and Hypersonic Systems and Technologies Conference

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“…The first attempts to control and trigger high-voltage discharges and lightning date back to the 1970's. They were based on high power and high-energy Nd:Glass laser or CO 2 nanosecond laser pulses and proved to be prohibitive for a distant operation [1,2,3,4,5,6,7,8,9,10,11]. Indeed, they required pulse energies of almost hundred Joules and their focusing resulted in avalanche ionization at the focus, with electron densities up to 10 20 cm −3 , above the critical plasma density in the mid-IR.…”

Section: Introductionmentioning

confidence: 99%

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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Laser-guided discharges in long gaps

Cited by 12 publications

References 9 publications

Short-pulse lasers for weather control

Short-pulse lasers for weather control

Energy Deposition II: Physical Mechanisms Underlying Techniques to Achieve High-Speed Flow Control

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

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