Abstract
Geometrical shapes of the damage sites in the 5-layer SiO2/ZrO2 anti-reflection (AR) coatings generated by l μm laser irradiation have been accurately determined. The damages can be classified into two types; deep damage and shallow damage, the former having the lower threshold. Dependence of the damage threshold of the deep damages on substrate surface roughness is given. It is suggested that presence of absorption centers embedded in the substrate is responsible for determining the damage threshold. Possible approaches that will lead to stronger AR coatings are proposed.
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