STP911: Measurements of the Dependence of Damage Thresholds on Laser Wavelength, Pulse Duration and Film Thickness

    Rainer, F
    Lawrence Livermore National Laboratory, Livermore, CA

    Vercimak, CL
    Lawrence Livermore National Laboratory, Livermore, CA

    Milam, D
    Lawrence Livermore National Laboratory, Livermore, CA

    Carniglia, CK
    Lawrence Livermore National Laboratory, Livermore, CA

    Hart, TT
    Lawrence Livermore National Laboratory, Livermore, CA

    Pages: 9    Published: Jan 1985


    Abstract

    Results of three experiments will be described. We used 351-nm and 355-nm pulses with durations of 0.6, 1, 5 and 9 ns to measure thresholds for a variety of anti-reflectance and high reflectance coatings. The functional form tm, with t the pulse duration, was used to scale fluence thresholds measured at 0.6 ns to those measured at 9.0 ns. Values of the coefficient m ranged from 0.10 to 0.51. The average value was 0.30. In the second experiment, we measured thresholds at 1064 nm, 527 nm and 355 nm for single-frequency high reflectance ZrO2/SiO2 coatings. Coatings for all three frequencies were deposited simultaneously by use of masks in the coating chamber. Thresholds varied from 2–4 J/cm2 at 355 nm to 7–10 J/cm2 at 1064 nm. The third experiment measured thresholds at 355 nm for antireflection coatings made with layer thicknesses varying from greater than one wavelength to less than a quarterwavelength. A significant variation of threshold with coating thickness was not observed, but the median thresholds increased slightly as coating thickness increased.

    Keywords:

    antireflective coatings, damage, laser-induced damage, optical coatings, pulse duration scaling, reflectors, thickness of coatings, wavelength scaling


    Paper ID: STP28978S

    Committee/Subcommittee: F01.19

    DOI: 10.1520/STP28978S


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