Abstract
Theoretical models of laser-induced damage mechanisms in optical materials are reviewed: inclusion-initiated thermal explosion (extrinsic mechanism) and impact ionization (II) and photoionization (intrinsic mechanisms). Different approaches to II theory based on quantum kinetic equation, Boltzman equations, and rate equations are briefly described. A relative contribution of II and photoionization predicted by these models at different laser pulse durations, including femtosecond-range, are discussed and compared with available experimental data. Basing on an analysis of published theoretical and experimental results, a today’s state of understanding fundamental laser damage mechanisms is concluded.
Highlights
Laser-induced damage (LID) in optical materials plays a significant role in laser-matter interaction phenomena
Major interests in LID studies were focused mostly to subpicosecond pulse duration range due to development of ultra high-power lasers based on chirped-pulse amplification concept.[5]
It seems reasonable to start describing the LID mechanisms that were proposed in the literature with a general survey
Summary
Laser-induced damage (LID) in optical materials plays a significant role in laser-matter interaction phenomena. This role can be both negative (a factor which limits laser intensity in high-power laser systems or material under study) and positive (providing a tool for material processing and modification). In this context, understanding of fundamental mechanisms of LID is very important for both laser science and its applications. A number of models for the LID mechanisms were suggested and investigated during almost 50 years of research since the first observation of laser damage.[1,2,3]. We can refer to only two recent publications on this topic,[6,7] where some aspects of the problem have been investigated rather comprehensively
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