Time-space distribution of laser-induced plasma parameters and its influence on emission spectra of the laser plumes

Ershov‐Pavlov, E. A.; Katsalap, K. Yu.; Stepanov, K. L.; Stankevich, Yu. A.

doi:10.1016/j.sab.2008.09.009

Cited by 28 publications

(12 citation statements)

References 38 publications

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“…The Pulsed laser-induced plasmas (LIPs) has a intensive application in material processing, thin film deposition, environmental monitoring, biomedical studies, military safety usage, art restoration/conservation and metal analysis, which is being produced after laser irradiance on the surface of metals and is of a great interest since last few decades [1][2][3][4][5][6][7][8][9][10][11]. In LIPS method, a micro-plasma is produced in nanosecond when highly intense laser pulse interacts with a target material; resultantly vaporization take place and thus plasma produced expand along the path of distribution in the form of vapor plume.…”

Section: Introductionmentioning

confidence: 99%

Measurement of electron number density and temperature of laser-induced Silver plasma

Musadiq¹,

Iqbal

Amin³

et al. 2012

IJET

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Silver (Ag) plasma generated by second harmonics (532 nm) using Nd:YAG laser has been investigated at 17.6 mJ and 88.6 mJ energy level. The spatial behavior of the END and Electron Temperature (ET) was measured at ambient air pressures at different energy level and distance ranging from 0-4.5 mm form the target metal. The ET's were found to be varies from 17895 K to 10593 K, while END was found to be 2.229  10 15 to 6.44  10 14 cm -3 and 1.76  10 16 to 1.893  10 15 cm -3 for 17.6 mJ and 88.6 mJ energy, respectively. The relationship of END and ET found directly related to laser irradiance, while they were inverse to the distance from the target material surface to laser beam source.

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Section: Introductionmentioning

confidence: 99%

Measurement of electron number density and temperature of laser-induced Silver plasma

Musadiq¹,

Iqbal

Amin³

et al. 2012

IJET

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“…In this case, it is considered that the flow is axially symmetric and the distribution function of the param eter Δn is monotonic, thus allowing one to apply the Abel equation to the reconstruction of the refraction index values in accordance with [21,22]:…”

Section: Experimental Data Processing Techniquementioning

confidence: 99%

“…Substituting (18) into (19), we obtain (20) (21) where N is the number of elements in a column of the distribution of the parameter S, ; is the scale of the interferogram image, and are the coefficients of expansion of the parameter S into a symmetric Fou rier series. This method requires significant computing time, and the dependence of the algorithm execution time on the number of elements at the input is a power function.…”

Section: Automation Of Data Processingmentioning

confidence: 99%

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Complex processing of interferograms of light-erosion gas-plasma streams in vacuum

et al. 2013

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A technique for automated processing of the results of interferometry of light erosion gas plasma flows using the local thermodynamic equilibrium approximation and data on the mass flow rate of the target substance was developed. The application of this technique allowed evaluation of the spatiotemporal distri butions of the optical (refraction and absorption coefficients), thermophysical (temperature, density, and electron concentration), gas dynamic (velocity distribution of particles, average mass velocity, and pressure), and optomechanical (momentum coupling coefficient) characteristics of light erosion gas plasma flows. The features of application of frequency filters at various stages of automatic processing of measurement results are considered. Examples of processing the experimental results that were obtained under the impact of ultrashort laser pulses on condensed media are presented.

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“…Doubled pulses were used in order to increase the ablation effectiveness [15]. Doubled laser pulses were repeated at a frequency of 10 Hz with a delay of 8 μs between pulses.…”

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confidence: 99%

Use of laser ablation in quantitative analysis of the elemental composition of art pigments

et al. 2011

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535.33The ability to use laser ablation for preparation of art pigment samples in quantitative analysis of their elemental composition by atomic emission spectroscopy of inductively coupled plasma is shown. The proposed technique enables one to eliminate errors associated with both the influence of strong acids and the stoichiometric disruption in a sample. Introduction.A study of the technical features underlying art works (stratigraphic structure, color palette, materials, ratio of materials in each structural element, etc.) can provide the information required to define the period and site of creation of a work and its authenticity [1] and can identify the optimal method for minimizing losses during restoration. Despite the development of highly sensitive physicochemical analytical methods, the identification of art materials remains one of the most complicated steps in the technical study of art works owing to the uniqueness of each specimen. Laser spectral microanalysis is currently used more and more often to identify inorganic pigments because it does not require preliminary sample preparation and enables the elemental composition in each structural fragment of the work to be determined. The art pigments used by the master cannot always be unambiguously identified from the observed elemental composition because several elements occur in different pigments. Not only the elements present but also their quantitative contents must be determined. Atomic emission spectroscopy of inductively coupled plasma (ICP-AES) is currently one of the most accurate methods for quantitative determination of the elemental composition of various substances [2][3][4].The most important step in the quantitative analysis of the elemental composition of a substance using ICP-AES is sample preparation. The principal goal is to dissolve the determined elements and to avoid losses of components because the analyzed samples are introduced as solutions. Classical methods for chemical dissolution (destruction and mineralization) do not always dissolve completely the samples even if closed autoclave and microwave oven systems are used. Incomplete dissolution of the sample (formation of a precipitate) leads to a loss of part of the sample during its preparation. This is largely responsible for an increase in the total uncertainty of the resulting quantitative data.Mineral pigments differ in their ability to dissolve in acids. This is explained by their chemical structure from the viewpoint of materials science. Mineral pigments can be transition-metal oxides, hydroxides, and salts. The chromophores in these pigments are fragments of a crystal lattice consisting of cations with variable valence (e.g., Fe, Mn, Cu, Ni, Cr) that are bonded to OH groups, O atoms, and H 2 O molecules [1]. Hydroxides and basic or amphoteric oxides dissolve readily in acids. Therefore, lead and zinc white pigments; azurite; malachite; red-lead; verdigris; Paris green; zinc, barite, and strontium yellows; massicot; and others are capable of dissolving. The reaction...

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Time-space distribution of laser-induced plasma parameters and its influence on emission spectra of the laser plumes

Cited by 28 publications

References 38 publications

Measurement of electron number density and temperature of laser-induced Silver plasma

Measurement of electron number density and temperature of laser-induced Silver plasma

Complex processing of interferograms of light-erosion gas-plasma streams in vacuum

Use of laser ablation in quantitative analysis of the elemental composition of art pigments

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