(in German)

Various factors like laser power and beam diameter have an influence on the laser resistance time of laser protective filters against laser radiation. But the effect of the age of the filters on their laser resistance time has not been studied, yet. The main objective of the project F 2442 is to investigate laser resistance time and optical properties spectral transmittance, luminous transmittance and diffusion of light versus the aging of laser protective filters. For these investigations experimental setups were realised to detect transmitting laser radiation behind the protective filters. The laser resistance tests were carried out with cw (continuous wave) and pulsed Nd:YAG laser sources at 1064 nm as well as a CO₂-laser at 10600 nm in cw- and pulsed mode. Standard materials for laser protective filters were artificially aged by UV-radiation and tested for their laser resistance. The results were compared to the results for new (unaged) materials. Only a little effect of the aging on the laser resistance time could be detected. The aging under UV-radiation has a more significant impact on the optical properties spectral transmittance and luminous transmittance. Besides the effects of artificial aging, natural ageing was examined, as well. For the naturally aged filters tested in the framework of this project, only a comparatively low significance on the laser resistance time and the optical properties was determined.

Please download the complete report "Aging resistance of laser protective filters" (in German only).