Laser-induced water condensation in air

Rohwetter, Philipp; Kasparian, Jérôme; Stelmaszczyk, K.; Hao, Zuoqiang; Henin, Stefano; Lascoux, N.; Nakaema, Walter M.; Petit, Yannick; Queißer, Manuel; Salamé, R.; Salmon, Estelle; Wöste, L.; Wolf, Jean‐Pierre

doi:10.1038/nphoton.2010.115

Cited by 186 publications

(134 citation statements)

References 32 publications

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“…This finding provides a better understanding of filamentation, and therefore allows to improve its modelling. It further confirms the relevance of the measured HOKE [8,9], with implications ranging from spectral broadening in optical fibers [25] to the generation of few-cycle pulses [26], atmospheric applications [5][6][7], or fermionic light [27].…”

supporting

confidence: 72%

“…Filamentation [1][2][3][4] is a self-guided propagation regime typical of high-power lasers, offering spectacular potential applications [5] like rainmaking [6] and lightning control [7]. We recently challenged its long-established mechanism by measuring the higher order Kerr effect (HOKE) in gases, implying that the non-linear refractive index must be written as ∆n Kerr = n 2j I j , where the non-linear indices n 2j are related to the (2j + 1) th electric susceptibility χ (2j+1) .…”

mentioning

confidence: 99%

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Transition from Plasma-Driven to Kerr-Driven Laser Filamentation

et al. 2011

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While filaments are generally interpreted as a dynamic balance between Kerr focusing and plasma defocusing, the role of the higher-order Kerr effect (HOKE) is actively debated as a potentially dominant defocusing contribution to filament stabilization. In a pump-probe experiment supported by numerical simulations, we demonstrate the transition between two distinct filamentation regimes at 800 nm. For long pulses (1.2 ps), the plasma substantially contributes to filamentation, while this contribution vanishes for short pulses (70 fs). These results confirm the occurrence, in adequate conditions, of filamentation driven by the HOKE rather than by plasma. *

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supporting

confidence: 72%

mentioning

confidence: 99%

Transition from Plasma-Driven to Kerr-Driven Laser Filamentation

et al. 2011

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“…During femtosecond laser FIL in air, many nonlinear effects occur simultaneously, such as intensity clamping, molecular alignment, harmonic generation, self-phase modulation and so on [3][4][5] . These complex and interesting nonlinear phenomena accompanying femtosecond laser FIL lead to promising applications in different fields, such as remote sensing [6,7] , few-cycle pulse compression [8] , atmospheric condensation and precipitation [9][10][11] , secondary light source generation ranging from air lasing to terahertz emission [12][13][14][15][16][17][18] , and triggering and guiding high-voltage discharge with possible applications in lightning control [19][20][21][22][23][24] .…”

Section: Introductionmentioning

confidence: 99%

Spectroscopic analysis of high electric field enhanced ionization in laser filaments in air for corona guiding

Wei

Liu

Wang

et al. 2016

High Pow Laser Sci Eng

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We report on a systematic experimental study on the fluorescence spectra produced from a femtosecond laser filament in air under a high electric field. The electric field alone was strong enough to create corona discharge (CD). Fluorescence spectra from neutral and ionic air molecules were measured and compared with pure high-voltage CD and pure laser filamentation (FIL). Among them, high electric field assisted laser FIL produced nitrogen fluorescence more efficiently than either pure CD or pure FIL processes. The nonlinear enhancement of fluorescence from the interaction of the laser filament and corona discharging electric field resulted in a more efficient ionization along the laser filament zone, which was confirmed by the spectroscopic measurement of both ionization-induced fluorescence and plasma-scattered 800 nm laser pulses. This is believed to be the key precursor process for filament-guided discharge.

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“…The plasma generation balances the Kerr self-focusing effect and leads to a limited beam diameter as well as limited peak intensity around 5×10 13 W/cm 2 (Refs. [15,16]), which is known as intensity clamping.…”

Section: Introductionmentioning

confidence: 99%

Nitrogen fluorescence induced by the femtosecond intense laser pulses in air

et al. 2016

High Pow Laser Sci Eng

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Our experiments show that external focusing and initial laser energy strongly influences filament generated by the femtosecond Ti-sapphire laser in air. The experimental measurements show the filament length can be extended both by increasing the laser energy and focal length of focusing lens. On the other hand, the plasma fluorescence emission can be enhanced by increasing the laser energy with fixed focal length or decreasing the focal length. In addition, the collapse distance measured experimentally are larger than the calculated ones owing to the group-velocity-dispersion effect. In addition, we find that the line widths of the spectral lines from N 2 is independent of filament positions, laser energies and external focusing.

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Laser-induced water condensation in air

Cited by 186 publications

References 32 publications

Transition from Plasma-Driven to Kerr-Driven Laser Filamentation

Transition from Plasma-Driven to Kerr-Driven Laser Filamentation

Spectroscopic analysis of high electric field enhanced ionization in laser filaments in air for corona guiding

Nitrogen fluorescence induced by the femtosecond intense laser pulses in air

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