Determination of the Elemental Composition of Aerosol by Femtosecond Laser-Induced Breakdown Spectroscopy

Babushkin, P. A.; Matvienko, G. G.; Oshlakov, V. K.

doi:10.1134/s102485602201002x

Cited by 9 publications

(4 citation statements)

References 13 publications

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“…2023, 15, 4004 2 of 14 recombination of generated free electrons with ions. For example, in an aqueous solution of table salt (sodium chloride), the spectral doublet of sodium with wavelengths near 590 nm possesses the highest emission intensity, which has been reported in many experiments on laser-induced femtosecond spectroscopy of model marine aerosols [7][8][9][10][11][12][13][14]. Importantly, the threshold for laser plasma formation in a spherical microparticle, in addition to the physical and chemical properties of particle substances, also depends on the parameters of the laser radiation (wavelength and pulse duration).…”

Section: Introductionmentioning

confidence: 87%

Angular Patterns of Nonlinear Emission in Dye Water Droplets Stimulated by a Femtosecond Laser Pulse for LiDAR Applications

Geints

2023

Remote Sensing

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Femtosecond laser-induced fluorescence (FLIF) and femtosecond laser-induced optical breakdown spectroscopy (FIBS) are important tools for remote diagnostics of atmospheric aerosols using LiDAR (Light Identification Detection and Ranging) technology. They are based on light emission excitation in disperse media via multiphoton nonlinear processes in aerosol particles induced by high-power optical pulses. To date, the main challenge restraining the large-scale application of FLIF and FIBS in atmospheric studies is the lack of a valued theory of the stimulated light emission in liquid microparticles with a sufficiently broad range of sizes. In this paper, we fill this gap and present a theoretical model of dye water droplet emission under high intensity laser exposure that adequately simulates the processes of multiphoton excited fluorescence and optical breakdown plasma emission in microparticles and gives quantitative estimates of the angular and power characteristics of nonlinear emission. The model is based on the numerical solution to the inhomogeneous Helmholtz equations for stimulating (primary) and nonlinear (secondary) waves provided by the random nature of molecule emission in particles. We show that droplet fluorescence stimulated by multiphoton absorption generally becomes more intense with increasing particle size. Moreover, far-field plasma emission from liquid particles demonstrates a larger angular diversity when changing the droplet radius in comparison with multiphoton excited fluorescence, which is mainly due to the excitation of the internal optical field resonances in spherical particles.

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Section: Introductionmentioning

confidence: 87%

Angular Patterns of Nonlinear Emission in Dye Water Droplets Stimulated by a Femtosecond Laser Pulse for LiDAR Applications

Geints

2023

Remote Sensing

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“…Femtosecond laser-induced fluorescence spectroscopy (FLIFS) and femtosecond laser-induced optical breakdown spectroscopy (FLIBS) are important tools for remote diagnostics of atmospheric aerosols using the LiDAR techniques. High intensity values inherent to the ultrashort optical radiation allow for overcoming the energy threshold for the realization of nonlinear-optical effects of multiphoton absorption and optical breakdown of matter inside the particles and provide for the receiving the emission signal from particles at long distances in the atmosphere via the lidars [1][2][3][4][5][6][7]. At sufficiently high laser intensity, a dyed liquid particle exposed to an optical radiation can be multiphoton-excited and exhibiting nonlinear emission in the spectral band of dye fluorescence.…”

Section: Introductionmentioning

confidence: 99%

Postfilament-Induced Two-Photon Fluorescence of Dyed Liquid Aerosol Enhanced by Structured Femtosecond Laser Pulse

Apeksimov,

Babushkin,

Geints

et al. 2024

Preprint

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Laser-induced fluorescence spectroscopy (LIFS) is actively used for remote sensing of atmospheric aerosols and currently is one of the most sensitive and selective techniques for determining small concentrations of substances inside particles. The use of high-power femtosecond laser sources for LIFS-based remote sensing of aerosol contributes to the development of new-generation fluorescence atmospheric lidars since it makes it possible overcoming the energy threshold for the nonlinear-optical effects of multiphoton absorption in particles and receiving the emission signal at long distances in the atmosphere. Our study is aimed to the development and experimental demonstration the technique of nonlinear laser-induced fluorescence spectroscopy (NLIFS) based on the remote excitation of aerosol fluorescent emission stimulated by a spatially-structured high-power femtosecond laser pulse. Importantly, for the first time to our knowledge, we demonstrate the advances of using stochastically-structured plasma-free intense light channels (postfilaments) specially formed by propagation of femtosecond laser radiation through a turbulent air layer for improving NLIFS efficiency. A multiple increase in the received signal of two-photon-excited fluorescence of polydisperse dyed aqueous aerosol by the structured postfilaments is reported.

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“…Laser-induced breakdown spectroscopy (LIBS) is a well-developed technique that relies on direct measurements of spectral line emissions from laser-induced plasma. Compared with other techniques, such as atomic absorption spectroscopy and inductively coupled plasma emission spectroscopy, LIBS can facilitate convenient, remote, fast, noncontact, and reliable in situ measurements of sample contents and concentrations, 1 – 5 which has been widely applied for trace element analyses in gas, 6 , 7 liquid, 8 – 15 or solid 16 – 21 samples. Nevertheless, as LIBS is implemented in aqueous solutions, there still exist great challenges in steering efficient laser ablation to generate plasmas of sufficiently long lifetimes as well as enhancing plasma excitations to improve detection sensitivities.…”

Section: Introductionmentioning

confidence: 99%

Detection of trace metals in water by filament- and plasma-grating-induced breakdown spectroscopy

Shi

et al. 2023

Adv. Photon. Nexus

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Filament-and plasma-grating-induced breakdown spectroscopy (F-GIBS) was demonstrated as an efficient technique for sensitive detection of metals in water, where plasma gratings were established through synchronized nonlinear interaction of two noncollinear filaments and an additional filament was generated with another fs laser beam propagating along their bisector. A water jet was constructed vertically to the three coplanar filaments, overcoming side effects from violent plasma explosion and bubble generation. Three distinct regimes of different mechanisms were validated for nonlinear couplings of the third filament with plasma gratings. As the third filament was temporally overlapped with the two noncollinear filaments in the interaction zone, all the three filaments participated in synchronous nonlinear interaction and plasma grating structures were altered by the addition of the third filament. As the third filament was positively or negatively delayed, the as-formed plasma gratings were elongated by the delayed third filament, or plasma gratings were formed in the presence of plasma expansion of the ahead third filament, respectively. Using F-GIBS for trace metal detection in water, significant spectral line enhancements were observed.

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Determination of the Elemental Composition of Aerosol by Femtosecond Laser-Induced Breakdown Spectroscopy

Cited by 9 publications

References 13 publications

Angular Patterns of Nonlinear Emission in Dye Water Droplets Stimulated by a Femtosecond Laser Pulse for LiDAR Applications

Angular Patterns of Nonlinear Emission in Dye Water Droplets Stimulated by a Femtosecond Laser Pulse for LiDAR Applications

Postfilament-Induced Two-Photon Fluorescence of Dyed Liquid Aerosol Enhanced by Structured Femtosecond Laser Pulse

Detection of trace metals in water by filament- and plasma-grating-induced breakdown spectroscopy

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