Temperature activated absorption during laser-induced damage: The evolution of laser-supported solid-state absorption fronts

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Previously we have shown that the size of laser induced damage sites in both KDP and SiO{sub 2} is largely governed by the duration of the laser pulse which creates them. Here we present a model based on experiment and simulation that accounts for this behavior. Specifically, we show that solid-state laser-supported absorption fronts are generated during a damage event and that these fronts propagate at constant velocities for laser intensities up to 4 GW/cm{sup 2}. It is the constant absorption front velocity that leads to the dependence of laser damage site size on pulse duration. We show that these ... continued below

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Carr, C W; Bude, J D; Shen, N & Demange, P October 26, 2010.

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Previously we have shown that the size of laser induced damage sites in both KDP and SiO{sub 2} is largely governed by the duration of the laser pulse which creates them. Here we present a model based on experiment and simulation that accounts for this behavior. Specifically, we show that solid-state laser-supported absorption fronts are generated during a damage event and that these fronts propagate at constant velocities for laser intensities up to 4 GW/cm{sup 2}. It is the constant absorption front velocity that leads to the dependence of laser damage site size on pulse duration. We show that these absorption fronts are driven principally by the temperature-activated deep sub band-gap optical absorptivity, free electron transport, and thermal diffusion in defect-free silica for temperatures up to 15,000K and pressures < 15GPa. In addition to the practical application of selecting an optimal laser for pre-initiation of large aperture optics, this work serves as a platform for understanding general laser-matter interactions in dielectrics under a variety of conditions.

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PDF-file: 13 pages; size: 1.1 Mbytes

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  • Presented at: SPIE Laser Damage Conference, Boulder, CO, United States, Sep 26 - Sep 29, 2010

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  • Report No.: LLNL-PROC-462148
  • Grant Number: W-7405-ENG-48
  • Office of Scientific & Technical Information Report Number: 1018778
  • Archival Resource Key: ark:/67531/metadc831461

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Office of Scientific & Technical Information Technical Reports

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  • October 26, 2010

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  • May 19, 2016, 3:16 p.m.

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  • Dec. 7, 2016, 11:02 p.m.

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Carr, C W; Bude, J D; Shen, N & Demange, P. Temperature activated absorption during laser-induced damage: The evolution of laser-supported solid-state absorption fronts, article, October 26, 2010; Livermore, California. (digital.library.unt.edu/ark:/67531/metadc831461/: accessed November 20, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.