Experiment and simulations on the energy reservoir effect in femtosecond light filaments

Liu, Weiwei; Théberge, F.; Arévalo, E.; Gravel, Jean-François; Becker, Andreas; Chin, See Leang

doi:10.1364/ol.30.002602

Cited by 110 publications

(66 citation statements)

References 17 publications

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“…However, the TH energy presents a maximum around t = 2~3 s and decreases substantially after 4 seconds when a larger opening is achieved. We argue that with a smaller pinhole of around 60 m, corresponding to the exposition time from 2 s to 4 s, the laser energy reservoir surrounding the filament core is largely blocked, preventing further filamentation after the pinhole [23,24]. Meanwhile, the third harmonic wave generated inside the intense core of the filament before the diaphragm is transmitted through the pinhole.…”

Section: Experiments Resultsmentioning

confidence: 90%

“…With the further enlargement of the pinhole opening, the transmitted laser power becomes larger than the P cr . As a result, a hypogenetic filament develops after the pinhole [23,24] and serves as additional TH source, contributing to the total TH yield in the far field. Therefore, the observed decreasing of the TH after t = 3 s in Fig.…”

Section: Experiments Resultsmentioning

confidence: 99%

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Efficient generation of third harmonic radiation in air filaments: A revisit

Liu

Durand

Houard

et al. 2011

Optics Communications

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Abstract:In this paper we revisit the third harmonic generation from a femtosecond laser filament in air and its significant enhancement (~ 100 times) with a intercepting pump pulse, which has been reported very recently. The enhanced third harmonic is studied as a function of the pulse polarization, time delay between the pump and signal pulses, laser pulse energy, etc. We provide an explanation for the enhancement of third harmonic based on a quenching of interference effects present near filamentation threshold. Simulations based on a two-color propagation code reproduce well the experimental observations and confirms our interpretation.

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Section: Experiments Resultsmentioning

confidence: 90%

Section: Experiments Resultsmentioning

confidence: 99%

Efficient generation of third harmonic radiation in air filaments: A revisit

Liu

Durand

Houard

et al. 2011

Optics Communications

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“…This has acquired a form of new research status for potentially utilizing ultrashort laser pulses for cloud seeding [1][2][3][4][5][6]. The observation of the phenomenon in various conditions by several groups is now well established, and some basic processes at play are identified [7][8][9][10][11][12][13][14]. The challenges that are being addressed in the current pre-proposal are as follows: a.…”

Section: Introductionmentioning

confidence: 99%

Development of Cyber-Physical System for Laser-Based Controlled Cloud Seeding

Rai

2017

Asian J Pharm Clin Res

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Objective: This research encompasses of developing a cyber-physical system, i.e., a system which can control the physical process of cloud formation by utilizing the light detection and ranging technology to modulate its frequency while directed on aerosol cloud to control the movement of cloud, formation, and precipitation in a test-bed setting.Methods: This involves utilization of advanced algorithms, image processing techniques to model cloud behavior, and artificial intelligence to control the laser frequency modulation and pulse count, directed or incidence angle to understand the response between laser effects on aerosol cloud.Results and Discussion: It will enable studying the detailed effects of laser-induced cloud nucleation and also in modeling the cloud behavior with respect to the feedback loop between induced affect through lasers upon the aerosol cloud.

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“…Filaments cannot be considered as virtual optical fibers guiding the light within their core: they continuously interact and exchange energy with the photon bath surrounding them [13][14][15][16]. This photon bath, also known as energy reservoir [13,17,18], plays a key role in the filamentation process. In particular, the photon bath feeds the filament and balances its energy losses, allowing it to self-heal after an obstacle [14][15][16] or extend its propagation distance [19].…”

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confidence: 99%

Gas-Solid Phase Transition in Laser Multiple Filamentation

et al. 2017

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While propagating in transparent media, near-infrared multi-terawatt (TW) laser beams break up in a multitude of filaments of typically 100-200 um diameter with peak intensities as high as 10 to 100 TW/cm 2 . We observe a phase transition at incident beam intensities of 0.4 TW/cm 2 , where the interaction between filaments induce solid-like 2-dimensional crystals with a 2.7 mm lattice constant, independent of the initial beam diameter. Below 0.4 TW/cm 2 , we evidence a mixed phase state in which some filaments are closely packed in localized clusters, nucleated on inhomogeneities (seeds) in the transverse intensity profile of the beam, and other are sparse with almost no interaction with their neighbors, similar to a gas. This analogy with a thermodynamic gas-solid phase transition is confirmed by calculating the interaction Hamiltonian between neighboring filaments, which takes into account the effect of diffraction, Kerr self-focusing and plasma generation. The shape of the effective potential is close to a Morse potential with an equilibrium bond length close to the observed value.Many physical systems are well described by statistical models driven by nearest-neighbor interactions, such as spin models [1][2][3]. Recently, we showed that the formation of multiple filamentation patterns in high-power ultrashort laser pulses also belong to this category [4,5].Laser filaments are produced in high-power, ultrashort laser pulses propagating in air or other transparent media [6][7][8] by a dynamic balance between Kerr selffocusing, and defocusing by higher-order non-linear effects including the ionization of the medium and other polarization saturation terms [9,10]. At 800 nm, this balance clamps the filaments intensity to typically 50 TW/cm 2 [11,12]. Filaments cannot be considered as virtual optical fibers guiding the light within their core: they continuously interact and exchange energy with the photon bath surrounding them [13][14][15][16]. This photon bath, also known as energy reservoir [13,17,18], plays a key role in the filamentation process. In particular, the photon bath feeds the filament and balances its energy losses, allowing it to self-heal after an obstacle [14][15][16] or extend its propagation distance [19].In the case of multifilamentation, the laser energy reservoir also mediates interactions between neighboring filaments [20][21][22][23][24][25][26]. This interaction is attractive if the filaments are in phase, and repulsive if they are in antiphase [27,28], corresponding to constructive and destructive interferences in the photon bath, respectively. Previous theoretical and experimental studies have shown that the relative phase between filaments is mainly randomly driven by intensity fluctuations during the collapse [29] and is then stabilized for the filaments propagating after the collapse [30].Recently we showed that at laser powers exceeding 100 TW, this mutual interaction limits the density of filaments in the transverse beam profile [31], resulting in the * corresponding author jean-pi...

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Experiment and simulations on the energy reservoir effect in femtosecond light filaments

Cited by 110 publications

References 17 publications

Efficient generation of third harmonic radiation in air filaments: A revisit

Efficient generation of third harmonic radiation in air filaments: A revisit

Development of Cyber-Physical System for Laser-Based Controlled Cloud Seeding

Gas-Solid Phase Transition in Laser Multiple Filamentation

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