Mr. Konrad Schrader Profile

Konrad Schrader

at LASEROPTIK GmbH

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Proceedings Article | 12 September 2021 Presentation + Paper

Ion beam sputtering of large scale dichroic mirror for fifth-harmonic separation

Mathias Mende, Konrad Schrader, Wolfgang Ebert, James Folta, Christopher Stolz

Proceedings Volume 11872, 118720F (2021) https://doi.org/10.1117/12.2597747

KEYWORDS: Coating, Thin films, Sputter deposition, Refractive index, High laser damage threshold optical coatings, High harmonic generation, Dielectric mirrors

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This contribution describes an approach to realize dichroic mirrors for fifth-harmonic separation with a diameter of 12”. The optics will be used at the National Ignition Facility to build a diagnostic based on Optical Thomson Scattering, which requires a high energy, pulsed laser operating at 211nm wavelength. Since the ultra-violet absorption edge of the most commonly used high refractive coating materials is above 211nm, only a few oxide materials as for example alumina are suitable for this wavelength. The applied material combination Al₂O₃/SiO₂ provides a small refractive index contrast of about 0.2, which requires a coating process with a very high precision and uniformity to realize complex thin film designs. To achieve a physical layer thickness uniformity better than 0.5%, the linear motion concept of the MAXIMA ion beam sputtering machine [1] is combined with an additional substrate rotation. The layer thickness is controlled precisely by optical broad band monitoring in the wavelength range from 220nm to 1050nm. To realize a surface figure of λ/10 at 633nm for a clear aperture of 250mm diameter, the multi-antireflection coating on the backside is utilized for stress compensation. Experimental results regarding the spectral performance, the mechanical stress, the surface roughness and the laser damage resistance will be presented and discussed.

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