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6 December 2010Results of applying a non-evaporative mitigation technique to laser-initiated surface damage on fused-silica
We present results from a study to determine an acceptable CO2 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 CO2 laser-based
mitigation protocol all survived 351 nm, 5 ns damage testing to fluences ⪆12.5 J/cm2. 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 m CO2 laser mitigation
protocol applicable to fused-silica optics used on fusion-class lasers like the National Ignition Facility (NIF).
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J. J. Adams, M. Bolourchi, J. D. Bude, G. M. Guss, M. J. Matthews, M. C. Nostrand, "Results of applying a non-evaporative mitigation technique to laser-initiated surface damage on fused-silica," Proc. SPIE 7842, Laser-Induced Damage in Optical Materials: 2010, 784223 (6 December 2010); https://doi.org/10.1117/12.867652