Results of applying a non-evaporative mitigation technique to laser-initiated surface damage on fused-silica

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We present results from a study to determine an acceptable CO{sub 2} laser-based non-evaporative mitigation protocol for use on surface damage sites in fused-silica optics. A promising protocol is identified and evaluated on a set of surface damage sites created under ICF-type laser conditions. Mitigation protocol acceptability criteria for damage re-initiation and growth, downstream intensification, and residual stress are discussed. In previous work, we found that a power ramp at the end of the protocol effectively minimizes the residual stress (<25 MPa) left in the substrate. However, the biggest difficulty in determining an acceptable protocol was balancing between low re-initiation ... continued below

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8 p. (0.2 MB)

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Adams, J J; Bolourchi, M; Bude, J D; Guss, G M; Matthews, M J & Nostrand, M C October 26, 2010.

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We present results from a study to determine an acceptable CO{sub 2} laser-based non-evaporative mitigation protocol for use on surface damage sites in fused-silica optics. A promising protocol is identified and evaluated on a set of surface damage sites created under ICF-type laser conditions. Mitigation protocol acceptability criteria for damage re-initiation and growth, downstream intensification, and residual stress are discussed. In previous work, we found that a power ramp at the end of the protocol effectively minimizes the residual stress (<25 MPa) left in the substrate. However, the biggest difficulty in determining an acceptable protocol was balancing between low re-initiation and problematic downstream intensification. Typical growing surface damage sites mitigated with a candidate CO{sub 2} laser-based mitigation protocol all survived 351 nm, 5 ns damage testing to fluences >12.5 J/cm{sup 2}. The downstream intensification arising from the mitigated sites is evaluated, and all but one of the sites has 100% passing downstream damage expectation values. We demonstrate, for the first time, a successful non-evaporative 10.6 {micro}m CO{sub 2} laser mitigation protocol applicable to fused-silica optics used on fusion-class lasers like the National Ignition Facility (NIF).

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8 p. (0.2 MB)

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PDF-file: 8 pages; size: 0.2 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-461655
  • Grant Number: W-7405-ENG-48
  • Office of Scientific & Technical Information Report Number: 1018768
  • Archival Resource Key: ark:/67531/metadc841324

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  • October 26, 2010

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  • May 19, 2016, 3:16 p.m.

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  • April 17, 2017, 2:06 p.m.

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Adams, J J; Bolourchi, M; Bude, J D; Guss, G M; Matthews, M J & Nostrand, M C. Results of applying a non-evaporative mitigation technique to laser-initiated surface damage on fused-silica, article, October 26, 2010; Livermore, California. (digital.library.unt.edu/ark:/67531/metadc841324/: accessed August 19, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.