High time-resolved spectroscopy of filament plasma in air

Ivanov, N. G.; Losev, V. F.; Prokop'ev, V. E.; Kirill, Sitnik,; Zyatikov, I.A.

doi:10.1016/j.optcom.2018.09.007

Cited by 11 publications

(5 citation statements)

References 21 publications

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“…In our earlier work, we stated that this is because of the high electron density associated with these kind of plasmas. This is similar to what has been observed by the group of Ivanov et al, who also observed a strong continuum with overlapping emission lines in the spectra related to femtosecond laser-induced filamentation. These emission lines primarily come from excited nitrogen molecules, e.g., the first negative system of N 2 + (B 2 Σ u + – X 2 Σ g + transition of N 2 + , 391.4 nm), and second positive system of N 2 (C 3 Π u → B 3 Π g ).…”

Section: Resultssupporting

confidence: 91%

Time- and Position-Dependent Breakdown Volume Calculations to Explain Experimentally Observed Femtosecond Laser-Induced Plasma Properties

et al. 2023

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Focusing of femtosecond laser pulses in gases can produce different gas breakdown phenomena depending on the focusing conditions: from simple optical breakdown like laser “sparks” to a nonlinear optical breakdown like filamentation. The dynamics of such plasmas after the pulse exposure is dependent on the energy deposited by the laser in the breakdown volume. Using a time- and position-dependent breakdown model, we estimate the breakdown volume and show that the energy deposited by the laser in this breakdown volume determines the characteristics of laser-induced plasma in the post-pulse exposure regime. Experimentally we find that for different focal lengths there exists a threshold value of the energy density beyond which a transition from an ellipsoidal shape to a spherical shape can be observed, followed by a toroidal expansion of the produced plasma. When electron density and electron temperature are expressed as a function of the energy density, deviations from the parabolic dependence on irradiance are observed. They imply additional ionization by multiphoton ionization in the plasma volume that occurs when the peak power of the laser pulse is above the critical power for self-focusing in air. The relevance of this experimental and theoretical study is to prevent undesired self-focusing conditions during material processing, a step toward well-controlled laser-plasma etching without laser ablation.

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Section: Resultssupporting

confidence: 91%

Time- and Position-Dependent Breakdown Volume Calculations to Explain Experimentally Observed Femtosecond Laser-Induced Plasma Properties

et al. 2023

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“…During femtosecond laser filamentation in atmosphere, the main components of N 2 and O 2 molecules can be excited and ionized and give rise to serial typical emissions (Figure 18a,c), which are mainly assigned to three spectral band systems: the second positive band system of N 2 (C 3 Π u -B 3 Π g transition), the first negative band system of N 2 + (B 2 Σ u + -X 2 Σ g + transition), and the characteristic Stark broadened atomic oxygen triplet that is centered at 777.4 nm (Figure 18c), where the emission lines of the first negative band and the second positive band are simply labelled as 1 and 2 [99,136,184,[260][261][262]. The clean fluorescence emission-free of the plasma continuum that is induced by femtosecond laser filament facilitate the high sensitive multicomponent analysis by FIPS.…”

Section: Multigas Pollutantsmentioning

confidence: 99%

Sensing with Femtosecond Laser Filamentation

Qian

Guo

et al. 2022

Sensors

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Femtosecond laser filamentation is a unique nonlinear optical phenomenon when high-power ultrafast laser propagation in all transparent optical media. During filamentation in the atmosphere, the ultrastrong field of 1013–1014 W/cm2 with a large distance ranging from meter to kilometers can effectively ionize, break, and excite the molecules and fragments, resulting in characteristic fingerprint emissions, which provide a great opportunity for investigating strong-field molecules interaction in complicated environments, especially remote sensing. Additionally, the ultrastrong intensity inside the filament can damage almost all the detectors and ignite various intricate higher order nonlinear optical effects. These extreme physical conditions and complicated phenomena make the sensing and controlling of filamentation challenging. This paper mainly focuses on recent research advances in sensing with femtosecond laser filamentation, including fundamental physics, sensing and manipulating methods, typical filament-based sensing techniques and application scenarios, opportunities, and challenges toward the filament-based remote sensing under different complicated conditions.

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“…In addition, these arc lights do not provide enough brightness for some applications, especially in the ultraviolet spectrum. Furthermore, the position of the arc can be unstable in these lamps (19,20).…”

Section: Te (Ev)mentioning

confidence: 99%

New Spectral Range Generations from Laser-plasma Interaction

2021

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High-intensity laser-produced plasma has been extensively investigated in many studies. In this demonstration, a new spectral range was observed in the resulted spectra from the laser-plasma interaction, which opens up new discussions for new light source generation. Moreover, the characterizations of plasma have been improved through the interaction process of laser-plasma. Three types of laser were incorporated in the measurements, continuous-wave CW He-Ne laser, CW diode green laser, pulse Nd: YAG laser. As the plasma system, DC glow discharge plasma under the vacuum chamber was considered in this research. The plasma spectral peaks were evaluated, where they refer to Nitrogen gas. The results indicated that the plasma intensity increased from several thousands to several tens of thousands through the process of interaction of the Nd: YAG laser with the plasma. This increase in the intensity of the plasma as laser intensity increased occurs regardless of laser wavelength involved in the interaction or not. According to laser-plasma interaction, the so-called full width at half maximum FWHM of the highest peak in the plasma spectrum was broadened from 1.43 to 2.73. Considering the equation of plasma density computing, the plasma density was increased from 1.07× 1018 to 2.05× 1018 cm-3 with increasing FWHM. As a result of the interaction, the electron temperature of plasma was increased from 0.176 to 0.782 eV. It was also noticed that the position of the highest peak in the plasma spectrum depends on the interacted laser wavelength.

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High time-resolved spectroscopy of filament plasma in air

Cited by 11 publications

References 21 publications

Time- and Position-Dependent Breakdown Volume Calculations to Explain Experimentally Observed Femtosecond Laser-Induced Plasma Properties

Time- and Position-Dependent Breakdown Volume Calculations to Explain Experimentally Observed Femtosecond Laser-Induced Plasma Properties

Sensing with Femtosecond Laser Filamentation

New Spectral Range Generations from Laser-plasma Interaction

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