Mirrors that are both lightweight and flexible could be compactly rolled up for the launch, and then accurately reshaped once they are deployed. Scientists have developed a new method to produce and shape large, high-quality mirrors, significantly thinner than the primary mirrors traditionally em
Researchers have developed a new way to make telescope mirrors that could enable much larger, and thus more sensitive, telescopes to be placed in orbit. Credit: Sebastian Rabien, Max Planck Institute for Extraterrestrial Physics
“Launching and deploying space telescopes is a complicated and costly procedure,” said Sebastian Rabien fromin Germany. “This new approach — which is very different from typical mirror production and polishing procedures — could help solve weight and packaging issues for telescope mirrors, enabling much larger, and thus more sensitive, telescopes to be placed in orbit.”
For chemical vapor deposition, a precursor material is evaporated and thermally split into monomeric molecules. Those molecules deposit on the surfaces in a vacuum chamber and then combine to form a polymer. This process is commonly used to apply coatings such as the ones that make electronics water-resistant, but this is the first time it has been used to create parabolic membrane mirrors with the optical qualities necessary for use in telescopes.
“It has long been known that rotating liquids that are aligned with the local gravitational axis will naturally form a paraboloid surface shape,” said Rabien. “Utilizing this basic physics phenomenon, we deposited a polymer onto this perfect optical surface, which formed a parabolic thin membrane that can be used as the primary mirror of a telescope once coated with a reflecting surface such as aluminum.
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