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Investigations in fs-laser damage mechanisms within the recent years indicate that damage mechanisms in the fs-range
are based on electronic interaction schemes in the material. Usually, a direct correlation of the power handling capability
to the band gap structure of the material and the field strength distribution in the optical system is observed.
The present work is focused on the optimization of high refractive index coating materials by mixing with silica. The
different compositions of mixed materials are manufactured with an IBS coating process using a zone target. This
technique allows for a continuous variation of the material composition.
In addition, new coating designs were developed to adapt the contents of silica within the layers to the high field
strengths. By combining these techniques a significant increase of the laser damage threshold could be accomplished.
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M. Jupé, M. Lappschies, L. Jensen, K. Starke, D. Ristau, "Improvement in laser irradiation resistance of fs- dielectric optics using silica mixtures," Proc. SPIE 6403, Laser-Induced Damage in Optical Materials: 2006, 64031A (23 January 2007); https://doi.org/10.1117/12.696131