Kilometer range filamentation: effects of filaments on transparent and non-transparent materials at long distances

Durand, Magali; Houard, Aurélien; Prade, B.; Mysyrowicz, A.; Durécu, Anne; Fleury, Didier; Moreau, B.; Vasseur, Olivier; Borchert, Harmut; Diener, K.; Schmitt, Rüdiger; Théberge, F.; Châteauneuf, Marc; Dubois, Jacques

doi:10.1364/cleo_si.2011.cthff3

Cited by 3 publications

(3 citation statements)

References 6 publications

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“…A discharge obtained with a positive polarity on the HV electrode corresponds to the propagation of an ascending negative leader, and vice versa. As a consequence of the differences between negative and positive leader characteristics and propagation speed, [4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19] results obtained with positive and negative polarities are quite different. Estimation of the negative discharge velocity based on the delay between the laser and the spark gives V -= 2.5x10 6 m/s, in good agreement with previously reported values for laser guided negative leader velocities.…”

Section: B Results and Discussionmentioning

confidence: 99%

“…We remind that ionization induced by filamentation has been measured recently up to 1 km distance from the laser. 17 The decrease of dielectric breakdown can reach a factor two for positive discharges, which would correspond to situations where the bottom of a cloud is positively charged. Furthermore, the initiation of the triggering of an electric discharge is flexible in terms of alignment.…”

Section: Implications For a Laser Lightning Rodmentioning

confidence: 99%

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Triggering, guiding and deviation of long air spark discharges with femtosecond laser filament

Forestier

Houard

Revel³

et al. 2012

AIP Advances

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In the perspective of the laser lightning rod, the ability of femtosecond filaments to trigger and to guide large scale discharges has been studied for several years. The present paper reports recent experimental results showing for the first time that filaments are able not only to trigger and guide but also to divert an electric discharge from its normal path. Laser filaments are also able to divert the spark without contact between laser and electrodes at large distance from the laser. A comparison between negative and positive discharge polarities also reveals important discrepancies in the guiding mechanism

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Section: B Results and Discussionmentioning

confidence: 99%

Section: Implications For a Laser Lightning Rodmentioning

confidence: 99%

Triggering, guiding and deviation of long air spark discharges with femtosecond laser filament

Forestier

Houard

Revel³

et al. 2012

AIP Advances

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show abstract

“…New Mexico researchers demonstrated laser triggered guided lightning discharge in laboratory and are working on long range propagation barrier facing long duration problem, cloud charge distribution over clouds in horizontal patches [18], or as a vertical line [115]. Recent reports show the kilometer long range remains no more a problem [116]. Japanese used pulsed 10.6µm CO 2 laser in their model experiment [113] but Americans used pulsed 248 nm KrF femtosecond laser to trigger the discharge and 530 nm CW laser to maintain the conductive path [110].…”

Section: Lightning Protection and Controlmentioning

confidence: 99%

Lightning Interactions with Humans and Lifelines

Kalair

Abas²,

Khan³

2013

JLR

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Lightning is one of the fascinating phenomena exhibiting tremendous natural power. It is source of awe, curiosity, enticement, inspiration as well as fear. On average, 50 lightning strikes occur on earth in one second. Fortunately not all of them kill people, albeit 10% people fall prey to lightning annually, out of which hardly 20 to 25% die. Lightning injures victims by heat, shockwave, intense brightness, radio waves, and secondary slip or fall mechanisms. Lightning injury is different from the normal electric shock as it involves transient flashover unlike the electrical contact freeze, wherein alternating (AC) and direct currents (DC) pass through the conductive interior body. Vacuity in knowledge is the driving force behind discoveries and inventions. Lightning experts had hardly developed any concurrence on lightning physics, and the observation of dark lightning complicated the Gordian knot. Lightning preventive, alerting and control devices help reduce fatality rates by the bolts out of blue skies. Lightning was considered to be the second cause of death making natural disasters after flashfloods but preventive measures have slithered it down to the third place in developed countries. Lightning prevention rule recommends 'when the thunder roars, go indoors'. This work describes lightning characteristics, damage thresholds to humans, machines, energy infrastructures, airplanes, wind turbines, light railway tractions, underground cables and pipelines. Power and energy lifelines such as transmission lines, oil tankers and gas or petroleum pipelines are susceptible to lightning strikes. Artificial rocket and laser triggered lightning protection and control techniques help to divert the lightning attacks. Interaction of lightning with power and energy infrastructures disrupts these lifelines. However, lightning itself is viewed as an extraterrestrial energy source. Lightning energy harvesting is an interesting application which has been investigated quantitatively.

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Expanding up to far-infrared filamentation-induced supercontinuum spanning in chalcogenide glasses

Mouawad¹,

Béjot²,

Mathey³

et al. 2018

Appl. Phys. B

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Kilometer range filamentation: effects of filaments on transparent and non-transparent materials at long distances

Cited by 3 publications

References 6 publications

Triggering, guiding and deviation of long air spark discharges with femtosecond laser filament

Triggering, guiding and deviation of long air spark discharges with femtosecond laser filament

Lightning Interactions with Humans and Lifelines

Expanding up to far-infrared filamentation-induced supercontinuum spanning in chalcogenide glasses

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