Induced transmittance in alexandrite laser eye-protectors—a survey of different types of laser filters

Different types of eye-protection filters are examined with the emphasis being laid on the irradiation-dependent spectral transmittance. Most of the dyes used for polycarbonate laser filters show the effect of induced transmittance. This may be critical with respect to eye safety because these absorber types are frequently used in filters for protection against alexandrite laser irradiation.