Laser-induced damage behaviors of Ta2O5/SiO2 narrow-band interference filters under different laser output modes

The laser-induced damage threshold(LIDT) and damage morphology of Ta2O5/SiO2 narrow-band interference filters under single-pulse laser and free-running laser were investigated. The weak absorptance and the standing-wave fields of the filters have also been measured and analyzed. It was shown that narrow-band interference filters had unique laser-induced damage behaviors. All the filters exhibited a pass-band center dependent LIDT and absorptance behavior: LIDT of the samples decreased, as the sample’s pass-band center was closer to laser wavelength 1 064 nm; Absorptances of the samples increased as the sample’s pass-band center was closer to laser wavelength 1 064 nm. Under single-pulse laser irradiation, the damage morphologies of the filters depended greatly on the irradiation waveleng