LASER DAMAGE STUDY OF THIN FILMS
Abstract
Damage thresholds for evaporated ZrO2 films and multilayers, in combination with MgF2 films, were determined using a Q-switched ruby laser. Antireflection and beam divider coatings as well as high reflecting quarterwave stacks were represented in the multilayers tested. Threshold values lie in the 30-40 J/sq. cm range for coatings with up to 15 layers. Beyond this the thresholds decrease. The CO2 laser assembled was improved by introducing O-ring seals for the Brewster windows and by more efficient water cooling. It is stable at 60 W multimode for periods of hours. Semi-quantitative observations were made on metal films of several thicknesses - Ag, Cu, Al, Au and Inconel. Au appears most damage resistant. Inconel films show promise for photographic recording at 10.6 micrometers.
Document Details
- Document Type
- Technical Report
- Publication Date
- Feb 28, 1970
- Accession Number
- AD0703272
Entities
People
- Arthur F. Turner
- Edward M. Arlin