Femtosecond pulse damage thresholds of dielectric coatings in vacuum

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At 10-7 Torr, the multiple femtosecond pulse damage threshold, F(?), is about 10% of the single pulse damage fluence F(1) for hafnia and silica films compared to about 65% and 50%, respectively, at 630 Torr. In contrast, the single-pulse damage threshold is pressure independent. The decrease of F(?) with decreasing air pressure correlates with the water vapor and oxygen content of the ambient gas with the former having the greater effect. The decrease in F(?) is likely associated with an accumulation of defects derived from oxygen deficiency, for example vacancies. From atmospheric air pressure to pressures of {approx}3 x 10{sup ... continued below

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5690-5697

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Michelle D. Shinn, Duy N. Nguyen, Luke A. Emmert ,Paul Schwoebel, Dinesh Patel, Carmen S. Menoni, Wolfgang Rudolph March 1, 2011.

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At 10-7 Torr, the multiple femtosecond pulse damage threshold, F(?), is about 10% of the single pulse damage fluence F(1) for hafnia and silica films compared to about 65% and 50%, respectively, at 630 Torr. In contrast, the single-pulse damage threshold is pressure independent. The decrease of F(?) with decreasing air pressure correlates with the water vapor and oxygen content of the ambient gas with the former having the greater effect. The decrease in F(?) is likely associated with an accumulation of defects derived from oxygen deficiency, for example vacancies. From atmospheric air pressure to pressures of {approx}3 x 10{sup -6} Torr, the damage 'crater' starts deterministically at the center of the beam and grows in diameter as the fluence increases. At pressure below 3x10-6 Torr, damage is initiated at random 'sites' within the exposed area in hafnia films, while the damage morphology remains deterministic in silica films. A possible explanation is that absorbing centers are created at predisposed sample sites in hafnia, for example at boundaries between crystallites, or crystalline and amorphous phases.

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5690-5697

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  • Journal Name: Optics Express; Journal Volume: 19; Journal Issue: 6

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  • Report No.: JLAB-FEL-11-1318
  • Report No.: DOE/OR/23177-1470
  • Grant Number: AC05-06OR23177
  • DOI: 10.1364/OE.19.005690 | External Link
  • Office of Scientific & Technical Information Report Number: 1028776
  • Archival Resource Key: ark:/67531/metadc846744

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  • March 1, 2011

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  • May 19, 2016, 3:16 p.m.

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  • Aug. 3, 2016, 3:26 p.m.

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Michelle D. Shinn, Duy N. Nguyen, Luke A. Emmert ,Paul Schwoebel, Dinesh Patel, Carmen S. Menoni, Wolfgang Rudolph. Femtosecond pulse damage thresholds of dielectric coatings in vacuum, article, March 1, 2011; Newport News, Virginia. (digital.library.unt.edu/ark:/67531/metadc846744/: accessed November 14, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.