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Excerpt from Unipolar Arcing: A Basic Laser Damage Mechanism
Unipolar arcing has been shown to be the primary plasma-surface interaction process when a laser produced plasma is in contact with a surface. Evidence of unipolar arcing was found on all targets irradiated at atmospheric pressure that also arced in vacuum, stainless steel, titanium, molybdenum, copper, and aluminum.
Cratering was observed even for a defocused and low - power laser pulse. The minimum laser power density required for the onset of breakdown on the surface is also sufficient to cause arc damage. Never was there a plasma evident without attendant unipolar arc craters. About are craters per cm:2 have been observed on laser illuminated metal surfaces although no external voltage is applied. Smaller size craters with a density of about 108/cm2 have been found on higher resistivity materials. The higher resistivity requires the radially inward surface return current to converge to a smaller cathode spot size to achieve sufficient power density to vaporize and ionize the material required for running the unipolar arc.
The local increase of the plasma pressure above the cathode spot leads to an electric field configuration which drives the arc current and also facilitates the return current flow to the surface and cathode spot.
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Unipolar Arcing: A Basic Laser Damage Mechanism (Classic Reprint)
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Paperback. Zustand: New. Print on Demand. This book delves into the fascinating and complex world of laser-plasma interactions, exploring the fundamental processes that occur when powerful laser beams strike a surface. The author guides readers through the intricate details of this interaction, revealing how the energy from the laser beam creates a plasma, a superheated state of matter, which then interacts with the surface in a series of cascading effects. The book particularly focuses on the phenomenon of unipolar arcing, a previously poorly understood process that involves the creation of electrical micro-arcs between the plasma and the surface. This phenomenon has far-reaching implications for understanding the nature of laser damage, and the author meticulously analyzes the physical mechanisms behind unipolar arcing, drawing on extensive experimental research. The book explores the critical role of unipolar arcing in the formation of craters on surfaces, a common consequence of laser-plasma interactions. The author presents a model that explains the conditions under which these craters form, emphasizing the crucial role of the plasma's properties and the material characteristics of the surface. This book provides a comprehensive understanding of this crucial interaction, bridging the gap between theoretical models and practical applications. This book is a reproduction of an important historical work, digitally reconstructed using state-of-the-art technology to preserve the original format. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in the book. print-on-demand item. Bestandsnummer des Verkäufers 9781528420785_0
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Unipolar Arcing
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PAP. Zustand: New. New Book. Shipped from UK. Established seller since 2000. Bestandsnummer des Verkäufers LX-9781528420785
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