Reactive evaporation of low-defect density hafnia
- Lawrence Livermore National Laboratory, University of California, Livermore, California 94551 (United States)
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.
- DOE Contract Number:
- W-7405-ENG-48
- OSTI ID:
- 5992980
- Journal Information:
- Applied Optics; (United States), Vol. 32:28; ISSN 0003-6935
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
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