Abstract.
Spatially defined patterning of multi-layer dielectric optical systems by laser-induced ablation is demonstrated. A 49-layer high-reflectivity mirror for 193-nm light was irradiated with F2-laser light through the CaF2-substrate to cleanly remove the whole dielectric stack by rear-sided ablation. The 157-nm light is absorbed efficiently by dielectric layers such as SiO2 and Al2O3 that are typically used for ultraviolet (UV) transmission at 193-nm and longer wavelengths. Thus it is possible to ablate highly reflective UV-laser mirrors (HR 193 nm) and to create dielectric masks that withstand high power levels at 193 nm. A single 157-nm pulse with a fluence of less than 500 mJ/cm2 is sufficient to cleanly ablate the whole layer stack with sharp edges and without debris deposition.
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Received: 31 October 2000 / Accepted: 14 November 2000 / Published online: 10 January 2001
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Schäfer, D., Ihlemann, J., Marowsky, G. et al. F2-laser ablation patterning of dielectric layers . Appl Phys A 72, 377–379 (2001). https://doi.org/10.1007/s003390100779
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DOI: https://doi.org/10.1007/s003390100779