Large area laser conditioning of dielectric thin film mirrors
The laser conditioning of dielectric thin film HR coatings has been studied as a practical method for the improvement of the damage thresholds of large area (1.1 m dia.) high power 1064 nm laser mirrors on the LLNL 120kJ, 100TW Nova laser system. Both HfO{sub 2}/SiO{sub 2} and /ZrO{sub 2}/SiO{sub 2}HR coatings were conditioned by rastering with a small ({approximately}0.2 mm) diameter beam from a pulsed (18 Hz, 8 ns) Nd-YAG laser (1064 nm). The samples were rastered at various fluences below the unconditioned damage threshold and subsequently damage tested. Large area conditioning studies were also performed using a large aperture beam of the Nova laser. The laser conditioning effect was found to be permanent. Improvements in damage threshold due to conditioning were as high as a factor of 2.7 and were dependent on the conditioning parameters. A model for the conditioning effect is proposed based on emptying of electronic defect levels within. 36 refs., 9 figs.
- Research Organization:
- Lawrence Livermore National Lab., CA (USA)
- Sponsoring Organization:
- DOE/DP
- DOE Contract Number:
- W-7405-ENG-48
- OSTI ID:
- 6799697
- Report Number(s):
- UCRL-101643; CONF-8911192--4; ON: DE90013485
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
36 MATERIALS SCIENCE
360206 -- Ceramics
Cermets
& Refractories-- Radiation Effects
70 PLASMA PHYSICS AND FUSION TECHNOLOGY
700208* -- Fusion Power Plant Technology-- Inertial Confinement Technology
CHALCOGENIDES
DAMAGE
DEPOSITION
DIELECTRIC MATERIALS
ELECTROMAGNETIC RADIATION
FILMS
HAFNIUM COMPOUNDS
HAFNIUM OXIDES
LASER MIRRORS
LASER RADIATION
LASERS
MATERIALS
MIRRORS
MODIFICATIONS
NEODYMIUM LASERS
OXIDES
OXYGEN COMPOUNDS
PHYSICAL RADIATION EFFECTS
RADIATION EFFECTS
RADIATIONS
REFRACTORY METAL COMPOUNDS
SILICON COMPOUNDS
SILICON OXIDES
SOLID STATE LASERS
SURFACE COATING
THIN FILMS
TRANSITION ELEMENT COMPOUNDS
ZIRCONIUM COMPOUNDS
ZIRCONIUM OXIDES
360206 -- Ceramics
Cermets
& Refractories-- Radiation Effects
70 PLASMA PHYSICS AND FUSION TECHNOLOGY
700208* -- Fusion Power Plant Technology-- Inertial Confinement Technology
CHALCOGENIDES
DAMAGE
DEPOSITION
DIELECTRIC MATERIALS
ELECTROMAGNETIC RADIATION
FILMS
HAFNIUM COMPOUNDS
HAFNIUM OXIDES
LASER MIRRORS
LASER RADIATION
LASERS
MATERIALS
MIRRORS
MODIFICATIONS
NEODYMIUM LASERS
OXIDES
OXYGEN COMPOUNDS
PHYSICAL RADIATION EFFECTS
RADIATION EFFECTS
RADIATIONS
REFRACTORY METAL COMPOUNDS
SILICON COMPOUNDS
SILICON OXIDES
SOLID STATE LASERS
SURFACE COATING
THIN FILMS
TRANSITION ELEMENT COMPOUNDS
ZIRCONIUM COMPOUNDS
ZIRCONIUM OXIDES