Achieving optimum spectral performance in the dielectric coating of large, slightly curved optics is a major challenge. LASEROPTIK with their highly specialised IBS machine ‘Teresa’ has achieved this with optics measuring 520 mm in diameter and weighing 35 kg each. The coated broadband mirrors are used as high reflectors from 380 to 950 nm in an astrophotonic spectrograph setup designed for the discovery of Earth-like planets. (Cover: ©LASEROPTIK_iStock/sankai )
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