Decay of femtosecond laser-induced plasma filaments in air, nitrogen, and argon for atmospheric and subatmospheric pressures

Aleksandrov, N. L.; Bodrov, S. B.; Tsarev, M. V.; Murzanev, A. A.; Sergeev, Yu. A.; Malkov, Yu. A.; Степанов, А. Н.

doi:10.1103/physreve.94.013204

Cited by 36 publications

(27 citation statements)

References 31 publications

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“…One can see that rapidly increases during the ionizing laser pulse and then decays shortly after (governed by dissociative recombination, electron attachment, and diffusion 28 , 37 – 39 ). Observed decay times (> 5–7 ns, after accounting for the logarithmic nature of the plot) are consistent with others’ computational and experimental work for air plasmas 4 , 7 , 9 , 36 , 38 . Note that plasmas may persist well after the conclusion of the laser pulse—particularly for lower pressures where the rates of dissociative recombination and electron attachment are reduced.…”

Section: Resultssupporting

confidence: 89%

Thomson and collisional regimes of in-phase coherent microwave scattering off gaseous microplasmas

Patel

Ranjan

Wang

et al. 2021

Sci Rep

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The total number of electrons in a classical microplasma can be non-intrusively measured through elastic in-phase coherent microwave scattering (CMS). Here, we establish a theoretical basis for the CMS diagnostic technique with an emphasis on Thomson and collisional scattering in short, thin unmagnetized plasma media. Experimental validation of the diagnostic is subsequently performed via linearly polarized, variable frequency (10.5–12 GHz) microwave scattering off laser induced 1–760 Torr air-based microplasmas (287.5 nm O2 resonant photoionization by ~ 5 ns, < 3 mJ pulses) with diverse ionization and collisional features. Namely, conducted studies include a verification of short-dipole-like radiation behavior, plasma volume imaging via ICCD photography, and measurements of relative phases, total scattering cross-sections, and total number of electrons $$N_{e}$$ N e in the generated plasma filaments following absolute calibration using a dielectric scattering sample. Findings of the paper suggest an ideality of CMS in the Thomson “free-electron” regime—where a detailed knowledge of plasma and collisional properties (which are often difficult to accurately characterize due to the potential influence of inhomogeneities, local temperatures and densities, present species, and so on) is unnecessary to extract $$N_{e}$$ N e from the scattered signal. The Thomson scattering regime of microwaves is further experimentally verified via measurements of the relative phase between the incident electric field and electron displacement.

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Section: Resultssupporting

confidence: 89%

Thomson and collisional regimes of in-phase coherent microwave scattering off gaseous microplasmas

Patel

Ranjan

Wang

et al. 2021

Sci Rep

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“…The plateau in probe phase at t  45 ns can be attributed to the interplay of two effects. Firstly, electron recombination within ~1030 ns [10][11][12], resulting in a gradual increase in refractive index (ionized argon has the longest recombination time of all the noble gases). And secondly, heating due to recombination, which induces a local overpressure proportional to N e [13].…”

Section: Methodsmentioning

confidence: 99%

Long-Lived Refractive-Index Changes Induced by Femtosecond Ionization in Gas-Filled Single-Ring Photonic-Crystal Fibers

et al. 2018

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We investigate refractive index changes caused by femtosecond photoionization in a gas-filled hollow-core photonic crystal fiber. Using spatially-resolved interferometric side-probing, we find that these changes live for tens of microseconds after the photoionization event -eight orders of magnitude longer than the pulse duration. Oscillations in the megahertz frequency range are simultaneously observed, caused by mechanical vibrations of the thin-walled capillaries surrounding the hollow core. These two non-local effects can affect the propagation of a second pulse that arrives within their lifetime, which works out to repetition rates of tens of kilohertz. Filling the fiber with an atomically lighter gas significantly reduces ionization, lessening the strength of the refractive index changes. The results will be important for understanding the dynamics of gasbased fiber systems operating at high intensities and high repetition rates, when temporally non-local interactions between successive laser pulses become relevant. I.

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“…Therefore, the TOF mass spectrometer measurements relied on theoretical estimation of total number of electrons in the focal zone in order to conduct absolute calibration of the system. Very recently, scattering of THz radiation from laser-induced plasmas was proposed for spatially unresolved relative measurements of n e 16 , 17 . Other recently proposed measurement techniques were based on measurements of capacitive response times of the system, including a capacitor coupled with laser-induced plasma loaded inside 22 – 24 .…”

Section: Introductionmentioning

confidence: 99%

Counting the electrons in a multiphoton ionization by elastic scattering of microwaves

Sharma

Slipchenko

Shneider

et al. 2018

Sci Rep

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Multiphoton ionization (MPI) is a fundamental first step in high-energy laser-matter interaction and is important for understanding the mechanism of plasma formation. With the discovery of MPI more than 50 years ago, there were numerous attempts to determine the basic physical constants of this process in direct experiments, namely photoionization rates and cross-sections of the MPI; however, no reliable data was available until now, and the spread in the literature values often reaches 2–3 orders of magnitude. This is due to the inability to conduct absolute measurements of plasma electron numbers generated by MPI, which leads to uncertainties and, sometimes, contradictions between MPI cross-section values utilized by different researchers across the field. Here, we report the first direct measurement of absolute plasma electron numbers generated at MPI of air, and subsequently we precisely determine the ionization rate and cross-section of eight-photon ionization of oxygen molecule by 800 nm photons σ8 = (3.3 ± 0.3)×10−130 W−8m16s−1. The method, based on the absolute measurement of the electron number created by MPI using elastic scattering of microwaves off the plasma volume in Rayleigh regime, establishes a general approach to directly measure and tabulate basic constants of the MPI process for various gases and photon energies.

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Decay of femtosecond laser-induced plasma filaments in air, nitrogen, and argon for atmospheric and subatmospheric pressures

Cited by 36 publications

References 31 publications

Thomson and collisional regimes of in-phase coherent microwave scattering off gaseous microplasmas

Thomson and collisional regimes of in-phase coherent microwave scattering off gaseous microplasmas

Long-Lived Refractive-Index Changes Induced by Femtosecond Ionization in Gas-Filled Single-Ring Photonic-Crystal Fibers

Counting the electrons in a multiphoton ionization by elastic scattering of microwaves

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