Investigation of the optical strength of gold coatings

An investigation was made of the influence of the substrate material, coating thickness, and conditions during evaporation and annealing on the optical strength of gold coatings illuminated with CO₂ laser pulses (interaction time ~ 100 nsec). It was found to be possible to prepare gold coatings whose optical strength was comparable with those of bulk metallic mirrors. Breakdown at the surface of a mirror could occur without causing any damage. Laser cleaning effect was also observed.