Laser-damage thresholds of thin-film optical coatings at 248 nm
We have measured the laser-induced damage thresholds for 248 nm wavelength light of over 100 optical coatings from commercial vendors and research institutions. All samples were irradiated once per damage site with temporally multi-lobed, 20-ns pulses generated by a KrF laser. The survey included high, partial, and dichroic reflectors, anti-reflective coatings, and single layer films. The samples were supplied by ten vendors. The majority of samples tested were high reflectors and antireflective coatings. The highest damage thresholds were 8.5 to 9.4 J/cm/sup 2/, respectively. Although these represent extremes of what has been tested so far, several vendors have produced coatings of both types with thresholds which consistently exceed 6 J/cm/sup 2/. Repeated irradiations of some sites were made on a few samples. These yielded no degradation in threshold, but in fact some improvement in damage resistance. These same samples also exhibited no change in threshold after being retested seven months later.
- Research Organization:
- Lawrence Livermore National Lab., CA (USA)
- DOE Contract Number:
- W-7405-ENG-48
- OSTI ID:
- 5264640
- Report Number(s):
- UCRL-86710; CONF-811117-5; ON: DE82007574; TRN: 82-013560
- Resource Relation:
- Conference: 13. annual Boulder damage symposium, Boulder, CO, USA, 17 Nov 1981
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
70 PLASMA PHYSICS AND FUSION TECHNOLOGY
ANTIREFLECTION COATINGS
PHYSICAL RADIATION EFFECTS
SURFACE COATING
CHEMICAL LASERS
KRYPTON FLUORIDES
LASER RADIATION
OPTICAL SYSTEMS
COATINGS
DEPOSITION
ELECTROMAGNETIC RADIATION
FLUORIDES
FLUORINE COMPOUNDS
HALIDES
HALOGEN COMPOUNDS
KRYPTON COMPOUNDS
LASERS
RADIATION EFFECTS
RADIATIONS
RARE GAS COMPOUNDS
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