Supercontinuum Induced by Filamentation of Bessel-Gaussian and Laguerre-Gaussian Beams in Water

Wu, Jiabin; Huo, Li; Ni, Yingxue; Wu, Zhiyong; Chen, Tao; Gao, Shijie; Li, Suyu

doi:10.3390/app12126005

Cited by 5 publications

(9 citation statements)

References 60 publications

(108 reference statements)

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“…is the critical power of self-focusing for Gaussian beams [26,28,29] (For a Gaussian beam, the topological charge is l = 0, and in this case, P(0) = P cr ). Previously, we have studied the filamentation of femtosecond vortex beams in water [31,32], further verifying the linear dependence of the filamentation threshold on the TC [31].…”

Section: Introductionsupporting

confidence: 52%

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Nitrogen fluorescence emission induced by femtosecond vortex beams in air

Wang

Zhang

et al. 2023

Phys. Scr.

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Fluorescence emission is a typical nonlinear phenomenon occurring during the femtosecond laser filamentation in air. The characteristics of nitrogen fluorescence emission induced by femtosecond vortex beams in air are experimentally studied. It is found that topological charge has a great influence on the nitrogen fluorescence emission induced by femtosecond filament: the fluorescence signals from nitrogen molecules (e.g., 337, 357 and 380 nm spectral lines) and molecular nitrogen ions (e.g., 391 and 428 nm spectral lines) differ much in the intensity distribution along the propagation direction. The discrepancy is explained by revisiting the generation mechanisms for nitrogen fluorescence, and it is found that the intersystem crossing scheme can account for it, indicating that the intersystem crossing scheme plays the main role in the formation of ${N_2}({C^3}\prod _u^ + )$. This work is helpful to the understanding of the physical mechanism of fluorescence emission induced by the filamentation of femtosecond vortex beams in air.

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Section: Introductionsupporting

confidence: 52%

“…However, these studies are limited to Gaussian beams. The discovery of orbital angular momentum (OAM) [22] makes the filamentation of femtosecond vortex b eams a hot research topic [23][24][25][26][27][28][29][30][31][32].…”

Section: Introductionmentioning

confidence: 99%

Nitrogen fluorescence emission induced by femtosecond vortex beams in air

Wang

Zhang

et al. 2023

Phys. Scr.

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“…As for femtosecond filamentation, the spectral range of SC undergoes drastic change around filamentation threshold P th (which is defined by power at which the femtosecond filamentation starts). When the pulse power is higher than P th , the spectral range of SC changes little, covering the entire visible wavelength band, which is independent of incident pulse energy/power [25,28,43]. As a consequence, the onset of femtosecond filamentation can be characterized by the appearance of SC: once SC can be detected, we can say that femtosecond filament is formed.…”

Section: Resultsmentioning

confidence: 99%

“…Water stands out among the condensed state media and is widely used in SC generation, for it can generate stable, ultrabroad, high intensity SC at a low cost. Femtosecond filamentation in water and the accompanied SC emission have been extensively studied in the past few decades [19][20][21][22][23][24][25][26][27][28][29][30][31][32][33][34][35][36]. In water, filamentation regimes mainly are driven by group velocity dispersion, higher-order dispersion and plasma absorption losses [19][20][21][22][23][24].…”

Section: Introductionmentioning

confidence: 99%

“…Since SC generation results from interaction between ultrashort laser pulses and matters, two main approaches have been adopted to control the SC generation in water: (1) adjusting the parameters of femtosecond laser pulses, and (2) changing the property of water. As for the first approach, by changing the spatial and temporal distribution of laser field [26][27][28], polarization state [29], pulse energy [30], etc., the interaction between laser pulses and water is affected. For example, the ionization rate and efficiency is greatly affected by pulse energy and laser polarization state, and consequently the temporal evolution of the plasmas and laser intensity is affected, leading to SPM effect and affecting the spectral broadening.…”

Section: Introductionmentioning

confidence: 99%

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Femtosecond filamentation in water studied by the interference of supercontinuum

Li¹,

Wang²,

Zhang³

et al. 2022

Phys. Scr.

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Supercontinuum (SC) generation is a typical nonlinear phenomenon that occurs during femtosecond filamentation in transparent media. The interference of the SC induced by femtosecond filament in water is explored by using interferometry with the aid of a Mach-Zehnder interferometer (MZI). In the low pulse energy case (single filament is formed), the MZI is used to precisely determine the actual value of filamentation threshold P_{th}. It is found that the value of P_{th} is much higher than that of the critical power for self-focusing P_{cr}. In the higher pulse energy case, by blocking one arm of the MZI, self-interference resulted from SC emitted by femtosecond filaments is studied. By analyzing the interference patterns, we can acquire information on femtosecond filament, such as filament number and filament spacing. The energy range for the generation of single, double and triple filaments in water is also determined. Diffraction effect will distort and even mask the interference patterns, and to eliminate its influence on the results, the spectral signals at shorter wavelength are selected. This work provides an effective approach to study the complex femtosecond filamentation process intuitively and conveniently.

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Conical emission induced by the Filamentation of femtosecond vortex beams in water

Liu,

Huo,

Zhu

et al. 2023

Preprint

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Conical emission is a typical nonlinear phenomenon that occurs when the femtosecond laser pulses interact with transparent media. In this work, the conical emission induced by two kinds of typical vortex beams (i.e., Laguerre-Gaussian (LG) and Bessel-Gaussian (BG) beams) in water is experimentally studied. By recording the light spots of different wavelengths on the screen, the characteristics of the conical emission induced by femtosecond vortex beams are studied. It is found that the spots of the supercontinuum induced by the two kinds of vortex beams differ greatly from each other: The spots of the supercontinuum induced by the BG beam are a set of concentric rings like a rainbow with a white center, while the whit light spot in the case of the LG beam are a circular white disk, which is different from the commonly observed white light spots. By measuring the maximum divergence angle, it is observed that the divergence angle increases with the decrease of the wavelength, while the TC merely affects the divergence angle, which is explained from the formation mechanism of conical emission in terms of self-phase modulation. We hope this work can be helpful to the understanding of interaction between the intense laser pulses and matters.

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Supercontinuum Induced by Filamentation of Bessel-Gaussian and Laguerre-Gaussian Beams in Water

Cited by 5 publications

References 60 publications

Nitrogen fluorescence emission induced by femtosecond vortex beams in air

Nitrogen fluorescence emission induced by femtosecond vortex beams in air

Femtosecond filamentation in water studied by the interference of supercontinuum

Conical emission induced by the Filamentation of femtosecond vortex beams in water

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