Molecular formation in the stagnation region of colliding laser-produced plasmas

Al-Shboul, Khaled F.; Hassan, S. M.; Harilal, S. S.

doi:10.1088/0963-0252/25/6/065017

Cited by 15 publications

(2 citation statements)

References 53 publications

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“…19a (Harilal et al, 1996), and it shows the modifications in C 2 emission kinetics due to the changes in species formation mechanisms. The OTOF method is routinely used by the LPP community for studying plasma chemistry (Skrodzki et al, 2019), self-absorption (Fu et al, 2019), ion acceleration (Thomas et al, 2020), 2D mapping of various species in the plume (Al-Shboul et al, 2016), and optimizing parameters for PLD (Druffner et al, 2005). The application of OTOF for studying the LPP plume chemistry is shown in Fig.…”

Section: Optical Time-of-flight Measurementsmentioning

confidence: 99%

Optical diagnostics of laser-produced plasmas

Harilal,

Phillips,

Froula

et al. 2022

Preprint

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Laser-produced plasmas (LPPs) engulf exotic and complex conditions ranging in temperature, density, pressure, magnetic and electric fields, charge states, charged particle kinetics, and gas-phase reactions, based on the irradiation conditions, target geometries, and the background cover gas. The application potential of the LPP is so diverse that it generates considerable interest for both basic and applied research areas. The fundamental research on LPPs can be traced back to the early 1960s, immediately after the invention of the laser. In the 1970s, the laser was identified as a tool to pursue inertial confinement fusion, and since then, several other technologies emerged out of LPPs. These applications prompted the development and adaptation of innovative diagnostic tools for understanding the fundamental nature and spatiotemporal properties of these complex systems. Although most of the traditional characterization techniques developed for other plasma sources can be used to characterize the LPPs, care must be taken to interpret the results because of their small size, transient nature, and inhomogeneities. The existence of the large spatiotemporal density and temperature gradients often necessitates non-uniform weighted averaging over distance and time. Among the various plasma characterization tools, optical-based diagnostic tools play a key role in the accurate measurements of LPP parameters. The optical toolbox contains optical probing methods (Thomson scattering, shadowgraphy, Schlieren, interferometry, velocimetry, and deflectometry), optical spectroscopy (emission, absorption, and fluorescence), and passive and active imaging. Each technique is useful for measuring a specific property, and its use is limited to a certain time span during the LPP evolution because of the sensitivity issues related to the selected measuring tool. Therefore, multiple diagnostic tools are essential for a comprehensive insight into the entire plasma behavior. In recent times, the improvements in performance in the lasers and detector systems expanded the capability of the aforementioned passive and active diagnostics tools. This review provides an overview of optical diagnostic tools frequently employed for the characterization of the LPPs and emphasizes techniques, associated assumptions, and challenges.

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Section: Optical Time-of-flight Measurementsmentioning

confidence: 99%

Optical diagnostics of laser-produced plasmas

Harilal,

Phillips,

Froula

et al. 2022

Preprint

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“…The collisionality of the two plumes can be affected by modifying the target geometry [11][12][13][14]. Hence, different target configurations such as collinear [15][16][17][18][19][20], crossed [21] and orthogonal [22,23] geometries have been applied to investigate the collision process.…”

Section: Introductionmentioning

confidence: 99%

The Effect of Confinement Angle on Self-Colliding Aluminium Laser Plasmas Using Spectrally Resolved Fast Imaging

et al. 2020

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In this work we investigate the effect of the confinement angle on self-colliding aluminium laser produced plasmas. More specifically, we apply V-shaped channel targets of different angles (90°, 60° and 30°) and report both broadband and filtered time-resolved fast imaging measurements on the formation of such plasmas in ambient air. Based on the broadband measurements we suggest that the plasmas formed on the two inner walls of the V-shaped channel expand normally to the surface, interact with each other and possibly stagnate. The spectrally filtered fast imaging reveals the presence of a spatial distribution of different species within the plasmas and signatures of forced recombination.

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