Laser Induced Damage in Inhomogeneous Optical Coatings.
AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OHIO SCHOOL OF ENGINEERING
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The structural effects of various optical coatings on their single shot laser induced damage threshold is discussed. Films were subjected to irradiation by a pulsed neodymium glass laser. In an attempt to isolate the influence of film stress on damage threshold, various stress films were constructed by mixing two component materials of similar damage thresholds but opposite stress characteristics. Results showed that stress-relieved films had higher damage thresholds. Additional vapor phase mixture films were prepared from component materials of widely different damage thresholds, changing the mixing ratio for each film. Damage results showed that thresholds for mixtures lie between the thresholds for each component, being somewhat dependent on the amount of each component present in the film. Discrete films showed a damage dependence on the angle of incidence of deposition. Results confirm that damage thresholds are very much material and residual stress dependent. Author
- Lasers and Masers
- Coatings, Colorants and Finishes