Proceedings PaperPreparation of dielectric highly reflective (HR) mirrors from colloidal oxide suspensions containing organic polymer binders
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Colloidal suspensions of oxides have been used to prepare dielectric HR mirrors, specifically for high power fusion laser applications, on substrates up to 38 cm square using a meniscus coater. These coatings consist of porous quarterwave layers of alternating high and low refractive index oxides. Silica was used exclusively as the low index oxide and AlOOH, ZrO2 or HfO2 as the high index material. Coatings were weak because of low particle-to- particle adhesion. The use of organic polymer binders in the high index component in particular, was found to increase strength thereby improving the laser damage threshold and also reducing the number of layers required for 99% reflection due to increase in the refractive index.