https://www.optica.org/en-us/about/newsroom/news_releases/2023/april/researchers_devise_new_membrane_mirrors_for_large/ Skip to main content This website uses cookies to deliver some of our products and services as well as for analytics and to provide you a more personalized experience. Visit our Cookie Notice to learn more. By continuing to use this site, you agree to our use of cookies. We've also updated our Privacy Notice. Visit our Privacy Policy to see what's new. [Allow all cookies] Optica | Formerly OSA [ ] [Search] Search Join Optica Log In Other Optica Sites Other Optica Sites * Optica Publishing Group * Optica Store * Prism * OPN * BEAM * FIO+LS * CLEO * OFC * Optics 4 Kids * Work in Optics * Living History * GEMM Initiative * NPI * Publications Submit a paper to Optica Publishing Group's world-class journals. Submit a Paper > Learn more about our Open Access options. Open Access Overview > Discover how to provide access to our content at your institution. Library Subscriptions > * Events + Event Calendar + Exhibits & Sponsorships + Services + Archives Keep current with events and meetings information. Sign up for email notifications > We recognize meetings that enhance the optics and photonics community. Request an endorsement > * Membership + Join Optica + Benefits & Services + Member Programs + Member Resources + Distinguished & Honorary Connect with an unparalleled global network of leading optics and photonics professionals. Join Optica > Exclusive access to an industry network, cutting-edge information and valuable resources to enhance your career and grow your business. Benefits & Services > * Industry + Corporate Membership + Industry Intelligence + Industry Events + Promotional Opportunities Make better business decisions with trusted industry intelligence from Optica. Industry Intelligence > Grow your business network at an Optica industry event. Industry Events > * Careers + Explore Careers + For Employers + Professional Development Submit your job listing to Work in Optics Add a job listing > Career Webinars Career Programming > * Foundation + Donate + Opportunities + NextGen Institute + About Support and recognize the next generation of optics and photonics Donate > Read our annual report and highlights from 2020 Explore our impact > * Get Involved + Awards & Honors + Diversity, Equity and Inclusion + Early Career + Education Outreach + Global Policy & Affairs + Local Sections + Students + Technical Groups + Volunteer Expand your network and discover tailored events and activities Join a Technical Group > Several of Optica's awards and honors are accepting nominations. Learn more. Nominate a colleague > * About + Optica Community + About Our Brand + Strategy + Leadership and Volunteers + Newsroom + Living History + Work at Optica + Video Library + Contact Us + Policies Other Optica Sites Search Menu Other Optica Sites * Optica Publishing Group * PRISM * BEAM * FIO+LS * CLEO * OFC * Optics 4 Kids * Living History * GEMM * NPI [ ] [Search] Menu * Publications * Events + Event Search + Event Services + Archives * Membership + Join Optica + Benefits & Services + Member Programs + Member Resources + Distinguished & Honorary * Industry + Corporate Membership + Industry Intelligence + Industry Events + Promotional Opportunities * Careers + Explore Careers + For Employers + Professional Development * Foundation + Donate + Opportunities + NextGen Institute + About * About + Optica Community + About Our Brand + Strategy + Leadership and Volunteers + Newsroom + What are Optics & Photonics? + Living History + Work at Optica + Contact Us + Policies * Get Involved + Awards & Honors + Diversity, Equity and Inclusion + Early Career + Education Outreach + Global Policy & Affairs + Local Sections + Students + Technical Groups + Volunteer Join Optica Log In Home / About / Newsroom / News Releases Menu * Optica Community * About Our Brand + Guiding Principles + Logos and Use Guidelines + Faces of Optica + Frequently Asked Questions * Strategy * Leadership & Volunteers + Board of Directors + Volunteer Opportunities + Past Officers + Councils and Committees + Executive Staff + Election for 2023 Offices * Newsroom + News Releases + Optica in the News + Corporate Member News + Member News + Discover Optica Blog + Obituaries + Optica Press Kit + Logos and Use Guidelines + Media Relations + Social Media Hub * What are Optics & Photonics? * Living History * Work at Optica * Contact Us + Global Headquarters + Visit Optica * Policies + Code of Conduct + Event Policies and Terms + Privacy Policy + Terms of Use + Cookie Notice + Health and Safety Practices + Registration Waivers for Eme... About * Optica Community * About Our Brand + Guiding Principles + Logos and Use Guidelines + Faces of Optica + Frequently Asked Questions * Strategy * Leadership & Volunteers + Board of Directors + Volunteer Opportunities + Past Officers + Councils and Committees + Executive Staff + Election for 2023 Offices * Newsroom + News Releases + Optica in the News + Corporate Member News + Member News + Discover Optica Blog + Obituaries + Optica Press Kit + Logos and Use Guidelines + Media Relations + Social Media Hub * Living History * Work at Optica * Contact Us + Global Headquarters + Visit Optica * Policies + Code of Conduct + Event Policies and Terms + Privacy Policy + Terms of Use + Cookie Notice + Registration Waivers for Eme... 4 April 2023 Researchers devise new membrane mirrors for large space-based telescopes Lightweight flexible mirrors could be rolled up during launch and then precisely reshaped after deployment [20m_show4] Caption: 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 WASHINGTON -- Researchers have developed a new way to produce and shape large, high-quality mirrors that are much thinner than the primary mirrors previously used for telescopes deployed in space. The resulting mirrors are flexible enough to be rolled up and stored compactly inside a launch vehicle. "Launching and deploying space telescopes is a complicated and costly procedure," said Sebastian Rabien from Max Planck Institute for Extraterrestrial Physics in 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." In the Optica Publishing Group journal Applied Optics, Rabien reports successful fabrication of parabolic membrane mirror prototypes up to 30 cm in diameter. These mirrors, which could be scaled up to the sizes needed in space telescopes, were created by using chemical vapor deposition to grow membrane mirrors on a rotating liquid inside a vacuum chamber. He also developed a method that uses heat to adaptively correct imperfections that might occur after the mirror is unfolded. "Although this work only demonstrated the feasibility of the methods, it lays the groundwork for larger packable mirror systems that are less expensive," said Rabien. "It could make lightweight mirrors that are 15 or 20 meters in diameter a reality, enabling space-based telescopes that are orders of magnitude more sensitive than ones currently deployed or being planned." [IMG_202301] Caption: The mirrors are created by using chemical vapor deposition to grow membrane mirrors on a rotating liquid inside a vacuum chamber. This allowed them to form parabolic thin membrane that can be used as the primary mirror of a telescope once coated with a reflecting surface such as aluminum. Credit: Sebastian Rabien, Max Planck Institute for Extraterrestrial Physics Applying an old process in a new way The new method was developed during the COVID-19 pandemic, which Rabien says gave him some extra time to think and try out new concepts. "In a long series of tests, we researched many liquids to find out their usability for the process, investigated how the polymer growth can be carried out homogeneously, and worked to optimize the process," he said. 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. To create the precise shape necessary for a telescope mirror, the researchers added a rotating container filled with a small amount of liquid to the inside of the vacuum chamber. The liquid forms a perfect parabolic shape onto which the polymer can grow, forming the mirror base. When the polymer is thick enough, a reflective metal layer is applied to the top via evaporation and the liquid is washed away. "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." Although other groups have created thin membranes for similar purposes, these mirrors are typically shaped using a high-quality optical mold. Using a liquid to form the shape is much more affordable and can be more easily scaled up to large sizes. [Rolled_09] Caption: Membrane mirrors made using the new technique are flexible enough to be rolled up. This could be helpful for storing the mirrors inside of a launch vehicle. Credit: Sebastian Rabien, Max Planck Institute for Extraterrestrial Physics Reshaping a folded mirror The thin and lightweight mirror created using this technique can easily be folded or rolled up during the trip to space. However, it would be nearly impossible to get it back to the perfect parabolic shape after unpacking. To reshape the membrane mirror, the researchers developed a thermal method that uses a localized temperature change created with light to enable adaptive shape control that can bring the thin membrane into the desired optical shape. The researchers tested their approach by creating 30-cm diameter membrane mirrors in a vacuum deposition chamber. After much trial and error, they were able to produce high quality mirrors with a surface shape suitable for telescopes. They also showed that their thermal radiative adaptive shaping method worked well, as demonstrated with an array of radiators and illumination from a digital light projector. The new membrane-based mirrors could also be used in adaptive optics systems. Adaptive optics can improve the performance of optical systems by using a deformable mirror to compensate for distortion in incoming light. Because the surface of the new membrane mirrors is deformable, these mirrors could be shaped with electrostatic actuators to create deformable mirrors that are less expensive to make than those created with conventional methods. Next, the researchers plan to apply more sophisticated adaptive control to study how well the final surface can be shaped and how much of an initial distortion can be tolerated. They also plan to create a meter-sized deposition chamber to better study the surface structure and packaging and unfolding processes for a large-scale primary mirror. Paper: S. Rabien, "Adaptive Parabolic Membrane Mirrors for Large Deployable Space Telescopes," Applied Optics, vol. 62, issue 11, pp. 2836-2844 (2023). DOI: https://doi.org/10.1364/AO.487262 Applied Optics Applied Optics publishes in-depth peer-reviewed content about applications-centered research in optics. These articles cover research in optical technology, photonics, lasers, information processing, sensing and environmental optics. Applied Optics is published three times per month by Optica Publishing Group and overseen by Editor-in-Chief Gisele Bennett, MEPSS LLC. For more information, visit Applied Optics . About Optica Publishing Group (formerly OSA) Optica Publishing Group is a division of the society, Optica (formerly OSA), Advancing Optics and Photonics Worldwide. It publishes the largest collection of peer-reviewed and most-cited content in optics and photonics, including 18 prestigious journals, the society's flagship member magazine, and papers and videos from more than 835 conferences. With over 400,000 journal articles, conference papers and videos to search, discover and access, our publications portfolio represents the full range of research in the field from around the globe. Media Contact mediarelations@optica.org Share: Optica.org * Publications * Events * Membership * Industry Information * Help * Contact Us * Policies & Legal Helpful Links * Join Optica or Renew * Store * Find an Event About Us Optica, advancing optics and photonics worldwide. Facebook Twitter LinkedIn YouTube Instagram Copyright (c) 2023 Optica www.optica.org You are navigating to the Optica Events Slack Workspace. If you are not already logged into your free Slack account, you will be asked to create one. Please note that this is different from your Optica account. Continue to Slack >