Ultraviolet damage resistance of laser coatings
The damage resistance of several thin-film materials used in ultraviolet laser optics was measured at 266 and 355 nm. The coatings included single, quarterwave (QW) layers of NaF, LaF/sub 3/, MgF/sub 2/, ThO/sub 2/, Al/sub 2/O/sub 3/, HfO/sub 2/, ZrO/sub 2/, Y/sub 2/O/sub 3/ and SiO/sub 2/, plus multilayer reflectors composed of some of these materials. The substrates were uv-grade fused silica. Single-shot thresholds were obtained with 22 ns and 27 ns (FWHM) pulses at 266 and 355 nm, respectively. One of the samples had previously been tested using 20-ps pulses, providing a pulsewidth comparison. At 266 nm the coating with the highest damage threshold was a QW layer of NaF at 10.8 J/cm/sup 2/ (450 MW/cm/sup 2/), whereas for a maximum reflector of Al/sub 2/O/sub 3//NaF the value was 3.6 J/cm/sup 2/ (154 MW/cm/sup 2/), and the threshold of the maximum reflector was 12.2 J/cm/sup 2/ (470 MW/cm/sup 2/). The results were analyzed to determine correlations with standing-wave electric fields and linear and two-photon absorption. Scaling relationships for wavelength, refractive index and atomic density, and pulsewidth were found.
- Research Organization:
- Los Alamos Scientific Lab., NM (USA)
- DOE Contract Number:
- W-7405-ENG-36
- OSTI ID:
- 6331268
- Report Number(s):
- LA-UR-78-2607; CONF-780982-1
- Country of Publication:
- United States
- Language:
- English
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420300 -- Engineering-- Lasers-- (-1989)
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700208* -- Fusion Power Plant Technology-- Inertial Confinement Technology
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ALKALI METAL COMPOUNDS
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CHALCOGENIDES
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LASERS
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MAGNESIUM FLUORIDES
OPTICAL SYSTEMS
OXIDES
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PHYSICAL RADIATION EFFECTS
RADIATION EFFECTS
RADIATIONS
RARE EARTH COMPOUNDS
SILICON COMPOUNDS
SILICON OXIDES
SODIUM COMPOUNDS
SODIUM FLUORIDES
THORIUM COMPOUNDS
THORIUM OXIDES
TRANSITION ELEMENT COMPOUNDS
ULTRAVIOLET RADIATION
YTTRIUM COMPOUNDS
YTTRIUM OXIDES
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ZIRCONIUM OXIDES
420300 -- Engineering-- Lasers-- (-1989)
70 PLASMA PHYSICS AND FUSION TECHNOLOGY
700208* -- Fusion Power Plant Technology-- Inertial Confinement Technology
ACTINIDE COMPOUNDS
ALKALI METAL COMPOUNDS
ALKALINE EARTH METAL COMPOUNDS
ALUMINIUM COMPOUNDS
ALUMINIUM OXIDES
CHALCOGENIDES
COATINGS
ELECTROMAGNETIC RADIATION
FLUORIDES
FLUORINE COMPOUNDS
GAS LASERS
HAFNIUM COMPOUNDS
HAFNIUM OXIDES
HALIDES
HALOGEN COMPOUNDS
LANTHANUM COMPOUNDS
LANTHANUM FLUORIDES
LASERS
MAGNESIUM COMPOUNDS
MAGNESIUM FLUORIDES
OPTICAL SYSTEMS
OXIDES
OXYGEN COMPOUNDS
PHYSICAL RADIATION EFFECTS
RADIATION EFFECTS
RADIATIONS
RARE EARTH COMPOUNDS
SILICON COMPOUNDS
SILICON OXIDES
SODIUM COMPOUNDS
SODIUM FLUORIDES
THORIUM COMPOUNDS
THORIUM OXIDES
TRANSITION ELEMENT COMPOUNDS
ULTRAVIOLET RADIATION
YTTRIUM COMPOUNDS
YTTRIUM OXIDES
ZIRCONIUM COMPOUNDS
ZIRCONIUM OXIDES