Shadowgraphic and interferometric investigations on Nd:YAG laser-induced vapor/plasma plumes for different processing wavelengths

Breitling, Detlef; Schittenhelm, H.-J.; Berger, Peter; Dausinger, Friedrich; Hügel, H.

doi:10.1007/s003390051454

Cited by 90 publications

(33 citation statements)

References 2 publications

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“…Single-pulse ablation of the single crystal . Therefore, at longer wavelengths, substantially higher absorption of the incident radiation can occur by the plasma and less radiation energy will be transmitted to the sample surface [24][25][26] .…”

Section: B) Phase Explosion Thresholdmentioning

confidence: 99%

Existence of Phase Explosion during Laser Ablation and Its Effects on Inductively Coupled Plasma-Mass Spectroscopy

et al. 2001

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A sudden increase in crater depth was observed during high irradiance (> 10 10 W/cm 2 ) laser ablation of silicon, and it is attributed to the phenomena of phase explosion.The threshold irradiance for phase explosion showed a dependence on two laser parameters; laser beam spot size and wavelength. For a larger beam size and longer incident wavelength, a higher laser irradiance was required to generate phase explosion.The rapid increase of crater depth above the phase explosion threshold irradiance correlated with a significant increase in the ICP-MS signal intensity. The ratio of crater volume to ICP-MS intensity, which represents entrainment efficiency, remained the lowest at laser irradiances slightly above the phase explosion threshold. However, this ratio increased at irradiances well above the threshold (> 10 11 W/cm 2 ). Chemical analysis using laser ablation at irradiance above 10 11 W/cm 2 provides increased sensitivity via improved entrainment and transport efficiency and increased ablation rate.

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Section: B) Phase Explosion Thresholdmentioning

confidence: 99%

Existence of Phase Explosion during Laser Ablation and Its Effects on Inductively Coupled Plasma-Mass Spectroscopy

et al. 2001

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“…Despite the efforts of computational [11][12][13][14] and experimental [15][16][17][18][19] studies to date, the prediction of the global energy balance remains difficult. The energy conversion from the laser to the kinetic energy of the ablation plume in a rare-gas atmosphere has been measured experimentally.…”

Section: Introductionmentioning

confidence: 99%

“…Even after the LSD wave is established, laser light of 1 lm partially penetrates the LSD wave, 11 and the transmitted laser light reaches the target surface, where the Knudsen layer 11,22 is formed. It is difficult to predict the absorption coefficient of the laser light in the Knudsen layer, whose optical properties are not well understood.…”

Section: Introductionmentioning

confidence: 99%

“…It is difficult to predict the absorption coefficient of the laser light in the Knudsen layer, whose optical properties are not well understood. According to the computations in a particular case, 11 around 70% of the laser power incident to the Knudsen layer is presumed to be reflected back. Meanwhile, when a 10 lm wavelength (CO 2 ) laser is used, the laser light is absorbed mostly at the LSD wave.…”

Section: Introductionmentioning

confidence: 99%

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Energy conversion and momentum coupling of the sub-kJ laser ablation of aluminum in air atmosphere

Mori

Maruyama

Shimamura

2015

Journal of Applied Physics

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Energy conversion and momentum coupling using nano-second 1-μm-wavelength pulse laser irradiation on an aluminum target were measured in air and nitrogen gas atmospheres over a wide range of laser pulse energies from sub-J to sub-kJ. From the expansion rate of the shock wave, the blast-wave energy conversion efficiency, ηbw, was deduced as 0.59 ± 0.02 in the air atmosphere at an ambient pressure from 30 to 101 kPa for a constant laser fluence at 115 J/cm2. Moreover, the momentum coupling of a circular disk target was formulated uniquely as a function of the dimensionless shock-wave radius and the ratio of the laser spot radius to the disk radius, while ηbw could be approximated as constant for the laser fluence from 4.7 to 4.1 kJ/cm2, and the ambient pressure from 0.1 to 101 kPa.

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“…Note that the results of interferometry with digital recording and data transformation using the fast Fourier transform algo rithm [5,6] are often processed incompletely [7,8]. As a rule, the possibilities of such processing are lim ited by the shortage of data on the mass flow of the tar get substance during laser ablation [9,10]. This leads to a decrease in the efficiency of applying these com plex and labor consuming methods.…”

Section: Introductionmentioning

confidence: 99%

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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Shadowgraphic and interferometric investigations on Nd:YAG laser-induced vapor/plasma plumes for different processing wavelengths

Cited by 90 publications

References 2 publications

Existence of Phase Explosion during Laser Ablation and Its Effects on Inductively Coupled Plasma-Mass Spectroscopy

Existence of Phase Explosion during Laser Ablation and Its Effects on Inductively Coupled Plasma-Mass Spectroscopy

Energy conversion and momentum coupling of the sub-kJ laser ablation of aluminum in air atmosphere

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

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