We maintain our effort together with the Lawrence Livermore National Laboratory in the research for high damage threshold optical coatings prepared from colloidal oxide suspensions, we have recently observed that single layers of ThO2 exhibits up to 12–13 J/cm2 under single pulse laser irradiation at 1064nm wavelength and Ins pulse duration. Associating this thoria with the silica reported earlier/1,2/, multilayer HR-coatings have been also elaborated by laying down quaterwave thick alternating coats, at room temperature. In this manner, we have achieved reflectivity adjacent to 97–98% with 21 layers. The laser-induced breakdown of these mirrors has unfortunately only been about 8–9 J/cm2, lower than the one of the high index thoria component.
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