Abstract

In order to improve the laser-induced damage threshold (LIDT) of the ZrO<sub>2</sub> film, the effect of polyvinyl pyrrolidone (PVP) with different average molecular weight on coatings is studied. The ZrO<sub>2</sub> sol is prepared by the hydrolysis of zirconium n-propoxide with acetylacetone as the chelating agent. The PVP (K16-18) is more suitable to obtain high LIDT coatings than other PVPs. The LIDT of the ZrO<sub>2</sub>-PVP coatings is improved with the increase of the PVP (K16-18) content. When the PVP (K16-18) content is 2.4 wt.-%, the LIDT of the ZrO<sub>2</sub>-PVP coatings is 43.5 J/cm<sup>2</sup> (1064 nm, 12 ns). The ZrO<sub>2</sub> sol and ZrO<sub>2</sub>-PVP (K16-18) sol have the good stability in 3 months. The refractive indices of the ZrO<sub>2</sub>-PVP coatings decrease with the increase of the PVP (K16-18) content.

© 2010 Chinese Optics Letters

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