Buddy Martin works for Steward Observatory, part of the College of Arizona. He receives funding from the Giant Magellan Telescope Organization. The College of Arizona is a accomplice in the Large Magellan Telescope.
The spin-forged mirror surface would not yet have the optical quality needed to make sharp pictures. But spinning gives it the appropriate overall curvature and saves our having to grind out 14 tons of glass from a flat surface – nearly as a lot glass as is left within the completed mirror. To information our sprucing, step one is to create a superfine contour map of the mirror’s floor, with steps of lower than 10 nanometers. As our ruler,” we use purple laser light; its divisions are the sunshine’s wavelength – about 630 nanometers – and it may be learn to about one hundredth of a division.
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