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Title: Reactive evaporation of low-defect density hafnia

Abstract

Motivation for this work includes observations at Lawrence Livermore National Laboratory of a correlation between laser damage thresholds and both the absorption and the nodular-defect density of coatings. Activated oxygen is used to increase the metal-oxidation kinetics at the coated surface during electron-beam deposition. A series of hafnia layers are made with various conditions: two [mu]-wave configuations, two sources (hafnium and hafnia), and two reactive oxygen pressures. Laser damage thresholds (1064-nm, 10-ns pulses), absorption (at 511 nm), and nodular-defect densities from these coatings are reported. The damage thresholds are observed to increase as the absorption of the coatings decreases. However, no significant increase in damage thresholds are observed with the coatings made from a low nodular-defect density source material (hafnium). Hafnia coatings can be made from hafnium sources that have lower nodular-defect densities, lower absorption, and damage thresholds that are comparable with coatings made from a conventional hafnia source.

Authors:
; ; ; ; ;  [1]
  1. Lawrence Livermore National Laboratory, University of California, Livermore, California 94551 (United States)
Publication Date:
OSTI Identifier:
5992980
DOE Contract Number:  
W-7405-ENG-48
Resource Type:
Journal Article
Journal Name:
Applied Optics; (United States)
Additional Journal Information:
Journal Volume: 32:28; Journal ID: ISSN 0003-6935
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; HAFNIUM OXIDES; PHYSICAL RADIATION EFFECTS; ABSORPTIVITY; ELECTRON BEAMS; ENERGY BEAM DEPOSITION FILMS; LASER RADIATION; OXYGEN; THIN FILMS; BEAMS; CHALCOGENIDES; COATINGS; ELECTROMAGNETIC RADIATION; ELEMENTS; FILMS; HAFNIUM COMPOUNDS; LEPTON BEAMS; NONMETALS; OPTICAL PROPERTIES; OXIDES; OXYGEN COMPOUNDS; PARTICLE BEAMS; PHYSICAL PROPERTIES; RADIATION EFFECTS; RADIATIONS; REFRACTORY METAL COMPOUNDS; TRANSITION ELEMENT COMPOUNDS; 360206* - Ceramics, Cermets, & Refractories- Radiation Effects

Citation Formats

Chow, R, Falabella, S, Loomis, G E, Rainer, F, Stolz, C J, and Kozlowski, M R. Reactive evaporation of low-defect density hafnia. United States: N. p., 1993. Web. doi:10.1364/AO.32.005567.
Chow, R, Falabella, S, Loomis, G E, Rainer, F, Stolz, C J, & Kozlowski, M R. Reactive evaporation of low-defect density hafnia. United States. https://doi.org/10.1364/AO.32.005567
Chow, R, Falabella, S, Loomis, G E, Rainer, F, Stolz, C J, and Kozlowski, M R. 1993. "Reactive evaporation of low-defect density hafnia". United States. https://doi.org/10.1364/AO.32.005567.
@article{osti_5992980,
title = {Reactive evaporation of low-defect density hafnia},
author = {Chow, R and Falabella, S and Loomis, G E and Rainer, F and Stolz, C J and Kozlowski, M R},
abstractNote = {Motivation for this work includes observations at Lawrence Livermore National Laboratory of a correlation between laser damage thresholds and both the absorption and the nodular-defect density of coatings. Activated oxygen is used to increase the metal-oxidation kinetics at the coated surface during electron-beam deposition. A series of hafnia layers are made with various conditions: two [mu]-wave configuations, two sources (hafnium and hafnia), and two reactive oxygen pressures. Laser damage thresholds (1064-nm, 10-ns pulses), absorption (at 511 nm), and nodular-defect densities from these coatings are reported. The damage thresholds are observed to increase as the absorption of the coatings decreases. However, no significant increase in damage thresholds are observed with the coatings made from a low nodular-defect density source material (hafnium). Hafnia coatings can be made from hafnium sources that have lower nodular-defect densities, lower absorption, and damage thresholds that are comparable with coatings made from a conventional hafnia source.},
doi = {10.1364/AO.32.005567},
url = {https://www.osti.gov/biblio/5992980}, journal = {Applied Optics; (United States)},
issn = {0003-6935},
number = ,
volume = 32:28,
place = {United States},
year = {Fri Oct 01 00:00:00 EDT 1993},
month = {Fri Oct 01 00:00:00 EDT 1993}
}