We have now established that sol-gel HR coatings prepared from colloidal oxide suspensions are superior to those prepared from solutions of precursor materials. Our investigation of single coatings of Zr02, Hf02 and A1203. H20 prepared from suspensions has indicated that those from Al203. H20 have the highest laser damage threshold at 1064 nm. We have prepared HR coatings by stacking Al203. H20 and Si02, also prepared from suspension, in the conventional manner achieving reflectivity of 99% with 35 layers. The damage threshold of these materials has however only been about half that of single coats of the component oxides.
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