Enhancement of femtosecond laser-induced plasma fluorescence using a nanosecond laser

Li, Xiaofeng; Li, Bo; Liu, Jixu; Zhu, Zhifeng; Zhang, Dayuan; Tian, Yifu; Gao, Qiang; Li, Zhongshan

doi:10.1364/oe.27.005755

Cited by 7 publications

(4 citation statements)

References 28 publications

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“…Therefore, the plasma has a long lifetime. However, fs pulse duration is shorter than the relaxation time between the electron and the lattice [38,39]. Due to the lack of interaction between laser and plasma, there is no effect of plasma reheating, so the duration of the plasma induced by fs laser is shorter.…”

Section: Methodsmentioning

confidence: 99%

“…In DP-LIBS, the inter-pulse delay is very important to the spectral signal. Using appropriate inter-pulse delays can ensure that the second laser pulse can better couple with the plasma produced by the first laser pulse and effectively increase the energy absorption for the second laser pulse, thus increasing the spectral intensity [39]. To better understand the emission enhancement of fs and ns DP-LIBS, we measured the time-resolved spectroscopy of laser-induced Cu plasma.…”

Section: Dp-libsmentioning

confidence: 99%

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Time-resolved spectroscopy of collinear femtosecond and nanosecond dual-pulse laser-induced Cu plasmas

Wang

Zeng

2021

Plasma Sci. Technol.

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In this paper, we investigate the time-resolved spectroscopy of collinear femtosecond (fs) and nanosecond (ns) dual-pulse (DP) laser-induced plasmas. A copper target was used as an experimental sample, and the fs laser was considered as the time zero reference point. The interpulse delay between fs and ns laser beams was 3 μs. First, we compared the time-resolved peak intensities of Cu (I) lines from Cu plasmas induced by fs+ns and ns+fs DP lasers with collinear configuration. The results showed that compared with the ns+fs DP, the fs+ns DP laser-induced Cu plasmas had stronger peak intensities and longer lifetimes. Second, we calculated time-resolved plasma temperatures using the Boltzmann plot with three spectral lines at Cu (I) 510.55, 515.32 and 521.82 nm. In addition, time-resolved electron densities were calculated based on Stark broadening with Cu (I) line at 521.82 nm. It was found that compared with ns+fs DP, the plasma temperatures and electron densities of the Cu plasmas induced by fs+ns DP laser were higher. Finally, we observed images of ablation craters under the two experimental conditions and found that the fs+ns DP laser-produced stronger ablation, which corresponded to stronger plasma emission.

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Section: Methodsmentioning

confidence: 99%

Section: Dp-libsmentioning

confidence: 99%

Time-resolved spectroscopy of collinear femtosecond and nanosecond dual-pulse laser-induced Cu plasmas

Wang

Zeng

2021

Plasma Sci. Technol.

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“…In the case of vacuum, the Anisimov model was used in this study to calculate the plasma variables. While Sedov-Taylor model, Friewald-Axford model, and Shock wave model were used in the case of background gas models [20][21][22][23][24]. Anisimov model was used in this theoretical research to compute the density of electrons in the plasma for the carbon element produced by Nd:YAG laser of fundamental wavelength 1064 nm, frequency 6 Hz, a pulse width of 10 ns.…”

Section: Introductionmentioning

confidence: 99%

Theoretical Computation of Electron Density in Laser-Induced Carbon Plasma using Anisimov Model

Abdulameer

2023

IJP

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In this work, electron number density calculated using Matlab program code with the writing algorithm of the program. Electron density was calculated using Anisimov model in a vacuum environment. The effect of spatial coordinates on the electron density was investigated in this study. It was found that the Z axis distance direction affects the electron number density (ne). There are many processes such as excitation; ionization and recombination within the plasma that possible affect the density of electrons. The results show that as Z axis distance increases electron number density decreases because of the recombination of electrons and ions at large distances from the target and the loss of thermal energy of the electrons in high distance with the progress of time and at a certain coordinate. The target is carbon (Graphite). The results were selected in four dimensions where three of them belong to spatial coordinates x, y, z and the fourth dimension is the electron density (ne).

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“…For example, the backward stimulated emission of N 2 from filaments has been reported in on-axis configuration with a strong dependence on the polarization state [35]. Also, the enhancement of the fluorescent signal up to 16 times has been achieved using a second ns pulse superim-posed on the filament [36]. Filamentation has also been used to induce the laser-induced fluorescence of UO 2 F 2 solution [37].…”

Section: Introductionmentioning

confidence: 99%

Ultrafast Laser-Excited Optical Emission of Xe under Loose-Focusing Conditions

Burger,

Latty,

Frigerio

et al. 2023

Sensors

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The optical filament-based radioxenon sensing can potentially overcome the constraints of conventional detection techniques that are relevant for nuclear security applications. This study investigates the spectral signatures of pure xenon (Xe) when excited by ultrafast laser filaments at near-atmosphericpressure and in short and loose-focusing conditions. The two focusing conditions lead to laser intensity differences of several orders of magnitude and different plasma transient behavior. The gaseous sample was excited at atmospheric pressure using ∼7 mJ pulses with a 35 fs pulse duration at 800 nm wavelength. The optical signatures were studied by time-resolved spectrometry and imaging in orthogonal light collection configurations in the ∼400 nm (VIS) and ∼800 nm (NIR) spectral regions. The most prominent spectral lines of atomic Xe are observable in both focusing conditions. An on-axis light collection from an atmospheric air–Xe plasma mixture demonstrates the potential of femtosecond filamentation for the remote sensing of noble gases.

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Enhancement of femtosecond laser-induced plasma fluorescence using a nanosecond laser

Cited by 7 publications

References 28 publications

Time-resolved spectroscopy of collinear femtosecond and nanosecond dual-pulse laser-induced Cu plasmas

Time-resolved spectroscopy of collinear femtosecond and nanosecond dual-pulse laser-induced Cu plasmas

Theoretical Computation of Electron Density in Laser-Induced Carbon Plasma using Anisimov Model

Ultrafast Laser-Excited Optical Emission of Xe under Loose-Focusing Conditions

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