Elongation of filamentation and enhancement of supercontinuum generation by a preformed air density hole

Chang, Junwei; li, dongwei; Xu, Litong; Zhang, Lanzhi; Xi, Tingting; Hao, Zuoqiang

doi:10.1364/oe.458128

Cited by 12 publications

(3 citation statements)

References 45 publications

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“…In order to study the influence of low-density holes generated by high repetition-rate lasers on the filamentation process in the steady state, a numerical simulation of ultrashort laser pulse filamentation was performed by solving the nonlinear Schrödinger equation (NLSE) coupled with the electron density evolution equation. The equations are written as follows [ 28 , 29 ] : …”

Section: Numerical Simulations and Resultsmentioning

confidence: 99%

Pulse repetition-rate effect on the intensity inside a femtosecond laser filament in air

YIN

Liu

et al. 2023

High Pow Laser Sci Eng

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As intense, ultrashort, kHz-repetition-rate laser systems become commercially available, pulse cumulative effects are critical for laser filament based applications. In this work, the pulse repetition rate effect on the femtosecond laser filamentation in air was investigated both numerically and experimentally. The pulse repetition rate effect has negligible influence at the leading edge of filament. Clear intensity enhancement from high repetition pulse is observed at the peak and tailing edge of laser filament. As the repetition rate of the laser pulses increasing from 100Hz to 1000Hz, the length of filament extends and the intensity inside the filament increases. A physical picture based on the pulse repetition

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Section: Numerical Simulations and Resultsmentioning

confidence: 99%

Pulse repetition-rate effect on the intensity inside a femtosecond laser filament in air

YIN

Liu

et al. 2023

High Pow Laser Sci Eng

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“…We define the starting and ending points of the filamentation as positions where the intensity is half of the peak intensity [49]. Therefore, the characteristic length of filamentation in the longitudinal direction is defined as the full width at half maximum (FWHM).…”

Section: The Relevant Characteristic Parameters Of Filamentationmentioning

confidence: 99%

Mitigation of laser plasma filamentation by rotating beam smoothing scheme

Nie,

Xiong,

Zhong

et al. 2024

J. Opt.

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The propagation of intense laser beams in plasma inevitably gives rise to laser plasma instabilities, which have a significant impact on the illumination uniformity of the focused spot on the target in inertial confinement fusion (ICF) facilities. Here we propose an ultrafast smoothing scheme using a rotating beam (RB) to mitigate the laser plasma filamentation. Using the propagation model of the rotating beam in plasma for the laser-plasma self-focusing (SF) and filamentation, the filamentation characteristics of laser spots were analyzed. The results indicate that the rotating beam smoothing scheme, operating at picosecond timescale, exhibits superior mitigation effect of laser plasma filamentation.

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“…The intensity in the filament is ~5 × 10 13 W/ cm 2 for free propagation [22] and ~10 14 W/ cm 2 under external focusing condition [23], corresponding electron density of 10 16 -10 18 cm −3 [24]. The formation of the filaments is a dynamically temporal evolution process simultaneously [25,26]. It is impossible to directly measure the intensity distribution by inserting any traditional detector in the channels because of the damage.…”

Section: Introductionmentioning

confidence: 99%

Toward 3D Imaging of Femtosecond Laser Filament in Air by A CCD within A Single Exposure

Wei¹,

Wang²,

Long³

et al. 2023

Preprint

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We experimentally demonstrated the 3D propagation of laser filament in air by an Fabry-Pérot (F-P) cavity assisted imaging within a single exposure. The F-P cavity was composed of two parallel mirrors with certain reflectivity and transmission at filament laser, so that the beam was reflected and refracted multiple times between the two mirrors. The cross-sectional intensity patterns at different longitudinal positions along filament within a single exposure of CCD (Charge-coupled Device) were recorded. When keeping the incident angle of the F-P cavity as a constant and reducing its spacing distance, a better longitudinally resolved evolution of cross-sectional filament intensity patterns was obtained. The intensity evolution along laser filament by the F-P cavity assisted imaging method was consistent with the filament fluorescence measurement from the side. As an application, the transition of laser propagation from linear to nonlinear was unveiled by the F-P cavity assisted 3D imaging.

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Elongation of filamentation and enhancement of supercontinuum generation by a preformed air density hole

Cited by 12 publications

References 45 publications

Pulse repetition-rate effect on the intensity inside a femtosecond laser filament in air

Pulse repetition-rate effect on the intensity inside a femtosecond laser filament in air

Mitigation of laser plasma filamentation by rotating beam smoothing scheme

Toward 3D Imaging of Femtosecond Laser Filament in Air by A CCD within A Single Exposure

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