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

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Title

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

Creator

  • Author: Carr, C W
    Creator Type: Personal
  • Author: Bude, J D
    Creator Type: Personal
  • Author: Shen, N
    Creator Type: Personal
  • Author: Demange, P
    Creator Type: Personal

Contributor

  • Sponsor: United States. Department of Energy.
    Contributor Type: Organization

Publisher

  • Name: Lawrence Livermore National Laboratory
    Place of Publication: Livermore, California
    Additional Info: Lawrence Livermore National Laboratory (LLNL), Livermore, CA

Date

  • Creation: 2010-10-26

Language

  • English

Description

  • Content Description: 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.
  • Physical Description: PDF-file: 13 pages; size: 1.1 Mbytes

Subject

  • Keyword: Dielectric Materials
  • Keyword: Thermal Diffusion
  • Keyword: Absorption
  • Keyword: Apertures
  • Keyword: Absorptivity
  • Keyword: Simulation
  • Keyword: Transport
  • STI Subject Categories: 42 Engineering
  • Keyword: Electrons
  • Keyword: Velocity
  • Keyword: Silica
  • Keyword: Optics
  • Keyword: Lasers

Source

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

Collection

  • Name: Office of Scientific & Technical Information Technical Reports
    Code: OSTI

Institution

  • Name: UNT Libraries Government Documents Department
    Code: UNTGD

Resource Type

  • Article

Format

  • Text

Identifier

  • 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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