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TMT Polished Mirror Assembly Measurement at Arizona Optical Systems (AOS) Lab

March 12th, 2021

Credit: Arizona Optical Systems / TMT

On March 3, 2021 in Tucson AZ, AOS successfully demonstrated the metrology system they have built to measure the aspheric prescription of the TMT primary mirror segments. This test set uses a full-aperture reference surface and a Fizeau interferometer to measure the curvature of the off-axis segments. This test set will guide the Ion Beam Figuring process which will bring the TMT segments to their final surface figure requirements.