Different dispersive coatings were tested in terms of laser-induced damage threshold by using a Ti:Sapphire laser
yielding 1 mJ, 30 fs pulses at 500 Hz repetition rate at 790 nm central wavelength. The beam was focused down
to 140 μm. Single layer coatings of Au, Ag,
Nb2O5, SiO2,
Ta2O5 and mixtures of
Ta2O5 and silica were examined
as well as different dispersive coatings. We observed a direct dependence of the damage threshold on the band
gap of the materials used to produce the different samples. The damage threshold values for the dispersive
coatings employing the same high index material lay within a range of 30% of each other.
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