In this video presentation, our sales director Marcel Demmler introduces the ion beam figuring technology for surface error correction of telescope mirrors under high vacuum conditions.
First, he shows two different types of telescopes: an X-ray telescope (Lynx) and a ground-based telescope (Extremely Large Telescope, ELT). Both have a very different mirror architecture, but they have in common that after grinding and polishing an additional process step is required to achieve the needed surface homogeneity. For this purpose, ion beam figuring is used for the final surface treatment. The material removal on the mirror is controlled by the speed of the focused ion beam. Fast scanning means lower removal, slow scanning means higher removal on those positions. But the removal rate is not only determined by dwell time, material and ion beam energy, but also by the angle of incidence. Learn how our software precisely calculates the movement profile, even if the mirror is curved and the angle of incidence changes during surface processing.
At the end of the session, Marcel Demmler presents process results to demonstrate the nanometer accuracy of ion beam figuring.
Here you can see the presentation.
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