Laser-damage thresholds of thin-film optical coatings at 248 nm

Conference · Fri Dec 11 04:00:00 EST 1981

OSTI ID:5264640

Milam, D; Rainer, F; Lowdermilk, W H

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
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360306* -- Composite Materials-- Radiation Effects-- (-1987)
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ANTIREFLECTION COATINGS
CHEMICAL LASERS
COATINGS
DEPOSITION
ELECTROMAGNETIC RADIATION
FLUORIDES
FLUORINE COMPOUNDS
HALIDES
HALOGEN COMPOUNDS
KRYPTON COMPOUNDS
KRYPTON FLUORIDES
LASER RADIATION
LASERS
OPTICAL SYSTEMS
PHYSICAL RADIATION EFFECTS
RADIATION EFFECTS
RADIATIONS
RARE GAS COMPOUNDS
SURFACE COATING