Visualization of jet development in laser-induced plasmas

Brieschenk, Stefan; O’Byrne, Sean; Kleine, H.

doi:10.1364/ol.38.000664

Cited by 20 publications

(10 citation statements)

References 10 publications

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“…In previous experiments, captured shadowgraphs of the breakdown plasma [97] served the purpose of visualizing the plasma expansion when using 850 mJ, 6-ns radiation. The captured images are consistent with results of fluid-dynamic expansion phenomena [98] presented in the literature. In laser-ablation research, shockwave expansion studies [99] from a solid sample into air or a into a gaseous environment such as argon are important for laser-induced breakdown spectroscopy (LIBS) that is applied for determination of elemental composition of the sample.…”

Section: Methodssupporting

confidence: 90%

Laser-Plasma Spectroscopy of Hydroxyl with Applications

et al. 2020

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This article discusses laser-induced laboratory-air plasma measurements and analysis of hydroxyl (OH) ultraviolet spectra. The computations of the OH spectra utilize line strength data that were developed previously and that are now communicated for the first time. The line strengths have been utilized extensively in interpretation of recorded molecular emission spectra and have been well-tested in laser-induced fluorescence applications for the purpose of temperature inferences from recorded data. Moreover, new experiments with Q-switched laser pulses illustrate occurrence of molecular recombination spectra for time delays of the order of several dozen of microseconds after plasma initiation. The OH signals occur due to the natural humidity in laboratory air. Centrifugal stretching of the Franck-Condon factors and r-centroids are included in the process of determining the line strengths that are communicated as a Supplementary File. Laser spectroscopy applications of detailed OH computations include laser-induced plasma and combustion analyses, to name but two applications. This work also includes literature references that address various diagnosis applications.

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Section: Methodssupporting

confidence: 90%

Laser-Plasma Spectroscopy of Hydroxyl with Applications

et al. 2020

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“…In previous experiments, captured shadowgraphs of the breakdown plasma [94] served the purpose of visualizing the plasma expansion when using 850 mJ, 6-ns radiation. The captured images are consistent with results of fluid-dynamic expansion phenomena [95] presented in the literature. In laser-ablation research, shockwave expansion studies [96] from a solid sample into air or a into a gaseous environment such as argon are important for laser-induced breakdown spectroscopy (LIBS) that is applied for determination of elemental composition of the sample.…”

Section: Methodssupporting

confidence: 90%

Laser-Plasma Spectroscopy of Hydroxyl with Applications

Parigger¹,

Helstern²,

Jordan³

et al. 2020

Preprint

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This article discusses laser-induced laboratory-air plasma measurements and analysis of hydroxyl (OH) ultraviolet spectra. New experiments with Q-switched laser pulses illustrate occurrence of molecular recombination spectra for time delays of the order of several dozen of microseconds after plasma initiation. The computation of the emission spectra utilizes line strength data that are communicated as a supplementary file. Applications of detailed OH computations include laser-induced plasma and combustion analyses, to name but two applications.

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“…The temperature decay is mainly caused by losses due to shock wave generation, radiation and bremsstrahlung [40]. A non-uniform plasma formation characterized by several hotspots within the plasma shape as observed by several groups [10,[42][43][44] is not observed in this study. In literature, the non-uniform formation is referred to spherical aberrations of applied lenses [42,45,46].…”

Section: Plasma Imaging During Energy Transfercontrasting

confidence: 54%

Influence of focal point properties on energy transfer and plasma evolution during laser ignition process with a passively q-switched laser

et al. 2016

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Miniaturized passively q-switched laser ignition systems are a promising alternative to conventional ignition sources to ensure a reliable ignition under difficult conditions. In this study the influences of focal point properties on energy transfer from laser to plasma as well as plasma formation and propagation are investigated as the first steps of the laser induced ignition process. Maximum fluence and fluence volume are introduced to characterize focal point properties for varying laser pulse energies and focusing configurations. The results show that the transferred laser energy increases with increasing maximum fluence. During laser emission plasma propagates along the beam path of the focused laser beam. Rising maximum fluence results in increased plasma volume, but expansion saturates when fluence volume reaches its maximum.

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Visualization of jet development in laser-induced plasmas

Cited by 20 publications

References 10 publications

Laser-Plasma Spectroscopy of Hydroxyl with Applications

Laser-Plasma Spectroscopy of Hydroxyl with Applications

Laser-Plasma Spectroscopy of Hydroxyl with Applications

Influence of focal point properties on energy transfer and plasma evolution during laser ignition process with a passively q-switched laser

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