Laser induced breakdown spectroscopy with picosecond pulse train

Lednev, V. N.; Першин, С. М.; Sdvizhenskii, P. A.; Grishin, M. Ya.; Davydov, M. A.; Stavertiy, A. Ya.; Tretyakov, R. S.

doi:10.1088/1612-202x/aa4fc0

Cited by 19 publications

(11 citation statements)

References 39 publications

(46 reference statements)

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“…The fs-plasma evolves and decays much faster than ps/ns-plasmas. , For 500 ns, after the laser strikes the material, ns-plasma kinetic energy is mainly spent in compressing the surrounding air and forming a shock wave. At this stage, the ns-spectrum is dominated by continuum radiation with no information to be collected precisely.…”

Section: Results and Discussionmentioning

confidence: 99%

“…Commonly, in ns-LIBS, delaying data acquisition with respect to laser firing to avoid the overwhelming continuum radiation and to suppress spectral interference due to line broadening costs ∼1–1.5 μs at optimized experimental configurations. Results reported for a ps-train showed that 700 ns was consumed by continuum emission to reduce to a background emission level . While ps/ns-plasmas’ absorptivity diminishes markedly to change the opacity from optically thick into transparent thin media, the fs-plasma lacks any kind of “plasma shielding” or “laser trail-plasma interaction”, which dominantly makes its evolution a confined and stable event.…”

Section: Results and Discussionmentioning

confidence: 99%

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Insights into Enhanced Repeatability of Femtosecond Laser-Induced Plasmas

et al. 2020

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Repeatability is of utmost importance as it is directly linked to measurement accuracy and precision of a technique and affects its cost, utility, and commercialization. The present paper contributes to explain enhanced repeatability of the femtosecond laser-induced breakdown spectroscopy (fs-LIBS) technique, remarkably significant for its industrial applications and instrumental size reduction. A fs-laser with 7 mJ pulse energy was focused to create a transient titanium plasma, and a high-resolution spectrometer was used to study time-resolved spectra and single-shot drilling sampling repeatability. Time-resolved spectroscopy study at a delay time interval of 0−1600 ns showed 200−400 ns as the optimum delay time zone for data acquisition with 2−4% line intensity RSDs. Plasma temperature RSDs were <1.8% for the investigated delay interval and reached 0.5% at 200 ns where the temperature recorded a maximum value of 22,000 K. Electron density reached 5.7 × 10 17 cm −3 at 200 ns, and RSDs were <3% with the least fluctuation of 0.7%. Shotto-shot RSDs were 3.5−5% at 15−30 drilling shot intervals for line intensities, <2% for plasma temperature, and <6.5% for electron density. Using an uncertainty propagation formula, total number density RSDs were calculated to be 1.9−5.3% for 50 single-shot drilling scenarios. Considering physics behind results, fs-plasmas are "stable ablation sources" due to their electrostatic formation mechanisms and confined hydrodynamic evolution. The fs-laser opens up new directions for LIBS applications where accuracy is significantly enhanced.

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Section: Results and Discussionmentioning

confidence: 99%

Section: Results and Discussionmentioning

confidence: 99%

Insights into Enhanced Repeatability of Femtosecond Laser-Induced Plasmas

et al. 2020

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“…Zhang and coauthors [28] determined accuracy, precision, and detection limits of seven elements in steel reference materials by optimizing laser energy, lens-to-sample distance, and delay time. Most recently, a comparative study between picoseconds (ps) and nanosecond (ns) laser pulses for LIBS measurements on steel samples was recently conducted [29]. Better SBRs for several atomic and ionic lines, as well as improved precision and limits of detection for the elements Fe, Cr, and Si were obtained with the ps laser.…”

Section: Introductionmentioning

confidence: 99%

Observation of dual-peak signal-to-noise ratios from plasmas produced in typical laser-induced breakdown spectroscopy (LIBS) experiments

Khater¹,

Eid²

2019

Journal of International Society for Science and Engineering

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In this work, emission properties of representative trace and major species in steel plasma plumes produced in typical laser-induced breakdown spectroscopy (LIBS) experiments under standard atmospheric conditions are investigated. The correlation between laser fluence and spatially integrated measurements of emission characteristics of the plasma at a typical delay time of 2 µs from the laser pulse onset is thoroughly explored. Q-switched neodymium-doped yttrium aluminum garnet (Nd: YAG) laser emitting at its fundamental wavelength of 1064 nm was employed to generate the plasmas under investigation. The results showed that the signal-to-noise ratio of all lines investigated exhibit irregular behaviour in which two maxima can be identified at specific laser fluence values. This behaviour is attributed to lower standard deviation of the background intensity indicating stable plasma conditions relevant for spectrochemical analysis. Plasma shielding of the incident laser energy, due to electron-atom inverse bremsstrahlung (IB), becomes more critical beyond laser fluencies larger than about 45 J cm -2 .

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“…Labutin et al [3] summarize nearly two decades of studies on femtosecond laser-induced breakdown spectrometry (fs-LIBS). Picosecond pulse train and nanosecond pulse were compared for laser ablation and LIBS measurements by Lednev et al [4].…”

Section: Introductionmentioning

confidence: 99%

Calibration Methods of Laser-Induced Breakdown Spectroscopy

Fu¹,

Jia²,

Wang³

et al. 2018

Calibration and Validation of Analytical Methods - A Sampling of Current Approaches

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Laser-induced breakdown spectroscopy (LIBS) has gained great attention over the past two decades due to its many advantages, such as needless sample preparation, capability of remote measurement and fast multielement simultaneous analysis. However, because of its inherent uncertainty features of plasma, it is still a big challenge for LIBS community worldwide to realize high sensitivity and accurate quantitative analysis. Currently, many chemometric analytical methods have been applied to LIBS calibration analysis, including univariate regression, multivariate regression, principal component regression (PCR), partial least squares regression (PLSR) and so on. In addition, appropriate sample and spectral pretreatment can effectively improve the analytical performance (i.e., limit of detection (LOD), accuracy and repeatability) of LIBS. In this chapter, we briefly summarize the progress of these calibration methods and their applications on LIBS and provide our recommendations.

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Laser induced breakdown spectroscopy with picosecond pulse train

Cited by 19 publications

References 39 publications

Insights into Enhanced Repeatability of Femtosecond Laser-Induced Plasmas

Insights into Enhanced Repeatability of Femtosecond Laser-Induced Plasmas

Observation of dual-peak signal-to-noise ratios from plasmas produced in typical laser-induced breakdown spectroscopy (LIBS) experiments

Calibration Methods of Laser-Induced Breakdown Spectroscopy

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