Holographic schlieren investigation of laser-induced plasmas

Chan, P. W.; Lee, C.S.

doi:10.1016/0375-9601(77)90574-6

Cited by 5 publications

(2 citation statements)

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“…There are two different ways to detect this variation: beam-deflection angle measurements (photoacoustic probe beam deflection, schlieren, shadowgraphy [12] or phase-measurements (i.e. interferometry [13] and holography [14])).…”

Section: Diagnostic Techniquesmentioning

confidence: 99%

Experimental simulation of lightning, interacting explosions and astrophysical jets with pulsed lasers

Villagrán-Munı́z

Sobral

Navarro‐González

et al. 2003

Plasma Phys. Control. Fusion

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Tabletop laboratory experiments have been used to simulate natural lightning, interacting explosions and astrophysical jets. When a high-energy laser pulse is focused in air, a laser-induced plasma (LIP) is produced, that generates a shock wave and an adiabatic expansion of the gas. In our work we have used LIPs in order to simulate lightning, for the study of chemical reactions relevant to atmospheric science.Several diagnostics have been applied to our LIPs, such as deflectometry, shadowgraphy and interferometry, which yield full spatial information of the process (electron density and temperature, the position of the shock wave fronts and the expansion of the hot gas), with a time resolution that ranges from nanoseconds to milliseconds. A new diagnostic alternative was implemented for shadowgraphy, which uses either continuous lasers or conventional light sources. The experimental results have been reproduced by hydrodynamic codes that we have developed.With astrophysical applications in mind, we have simulated and diagnosed the interaction of two explosions, with the aforementioned techniques. For this purpose, two LIPs are synchronized and diagnosed spatially and temporarily. Also, by producing the LIP in a glass sphere with a nozzle that ejects a shock wave and hot gas, we are able to simulate astrophysical jets. With such experiments, astrophysical models developed by us have been validated, showing excellent agreement between experiments and numerical simulations.

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Section: Diagnostic Techniquesmentioning

confidence: 99%

Experimental simulation of lightning, interacting explosions and astrophysical jets with pulsed lasers

Villagrán-Munı́z

Sobral

Navarro‐González

et al. 2003

Plasma Phys. Control. Fusion

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“…First experiments on visualizing the region of laser breakdown have been performed in gaseous atmosphere [22,23]. Studying the optical breakdown has been carried out in the microsecond and partially in nanosecond ranges, by applying coherent and noncoherent techniques [24][25][26][27][28].…”

Section: Visualization Techniques For Optical Breakdownmentioning

confidence: 99%

Optical Breakdown in Liquid Suspensions and Its Analytical Applications

Kovalchuk-Kogan

Bulatov

Schechter

2015

Advances in Chemistry

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Micro-and nanoparticles persist in all environmental aquatic systems and their identification and quantification are of considerable importance. Therefore, the application of Laser-induced breakdown to aquatic particles is of interest. Since direct application of this method to water samples is difficult, further understanding of the breakdown is needed. We describe several optical techniques for investigation of laser breakdown in water, including Mach-Zehnder interferometry, shadow, and Schlieren diagnostic. They allow for studying the time dependent structure and physical properties of the breakdown at high temporal and spatial resolutions. Monitoring the formation of microbubbles, their expansion, and the evolution of the associated shockwaves are described. The new understanding is that the plasma column in liquids has a discrete nature, which lasts up to 100 ns. Controlling the generation of nanoparticles in the irradiated liquids is discussed. It is shown that multivariate analysis of laser-induced breakdown spectroscopy allows for differentiation between various groups of suspended particulates.This review is dedicated to the memory of Gregory Toker, a devoted scientist who had major contributions to the field of optical breakdown and its investigation using interferometric techniques, who passed away during the preparation of this review Hindawi Publishing Corporation

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