30 May 2003 Identification and elimination of fluorescent surface-damage precursors on DKDP optics
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Fluorescing surface defects that led to damage upon 351-nm laser exposure below 7 J/cm2 (3-ns) in DKDP optics were reported in these proceedings by this group a year ago. Subsequent laser damage experiments have correlated the density of these damage precursors to single-pont diamond finishing conditions. Every diamond-finishing schedule contains brittle-mode cutting and ductile-mode cutting in a taper-down sequence. Finishing experiments have traced the occurrence of these defects to insufficient ductile-mode removal of subsurface damage incurred during piror brittle-mode cutting. Additionally, a correlation between defect fluorescence, laser-induced damage, and defect meorphology has been established. Laser-induced damage tests also suggest a correlation between growth method and damage probability. Current experiments indicate that damage-prone defects can be minimized with the proper choice of diamond finishing conditions.
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Mike C. Nostrand, Samuel L. Thompson, Wigbert J. Siekhaus, Michael J. Fluss, Douglas E. Hahn, Pamela K. Whitman, Alan K. Burnham, "Identification and elimination of fluorescent surface-damage precursors on DKDP optics", Proc. SPIE 4932, Laser-Induced Damage in Optical Materials: 2002 and 7th International Workshop on Laser Beam and Optics Characterization, (30 May 2003); doi: 10.1117/12.472041; https://doi.org/10.1117/12.472041

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