Study of Surface Finishing and Coating of DF Laser Windows.
Annual technical rept. 1 Apr 75-31 Mar 76,
HUGHES RESEARCH LABS MALIBU CALIF
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Work was done in surface finishing to provide optimum surfaces for film adhesion and to eliminate damage and contaminants which contribute to absorption, reduce laser damage thresholds, and reduce environmental stability. Attention was focused on techniques to fabricate flat and parallel windows, with the ultimate goal of scale-up to satisfy operational needs. Emphasis was placed on SrF2 and CaF2 windows since these are the current best candidates for the DF laser band. The properties of coating materials were studied to develop a catalog of usable materials. Particular attention was paid to refractive indices which are necessary for the design of antireflective coatings that have low reflectance over the entire DF laser band. The results of this survey provide the only firm data to date on the absorption of prospective coating materials in the DF laser band.
- Lasers and Masers