Abstract
High-reflection coatings with broad bandwidth can be achieved by pairing a low refractive index material, such as , with a high refractive index material, such as . To achieve high refractive index, low absorption films, we optimized the reactive, ion-assisted deposition process ( levels, deposition rate, and ion beam settings) using e-beam evaporated Ti. high-index layers were then paired with low-index layers in a quarter-wave-type coating to achieve a broader high-reflection bandwidth compared to the same coating composed of layer pairs. However, the improved bandwidth exhibited by the coating is associated with lower laser damage threshold. To improve the laser damage resistance of the coating, we also created four coatings where replaced some of the outer layers. We present the laser damage results of these coatings to understand the trade-offs between good laser damage resistance and high-reflection bandwidth using and .
© 2013 Optical Society of America
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