Physics – Optics
Scientific paper
Jan 2012
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2012aas...21913604n&link_type=abstract
American Astronomical Society, AAS Meeting #219, #136.04
Physics
Optics
Scientific paper
JWST has blazed a path for segmented deployed space telescopes, enabling larger apertures to be launched than were possible by the principles of the Hubble Space Telescope. Future telescopes for earth science, earth surveillance, and astronomy from space will inherit that experience, but will also face tougher challenges. For earth observing and astronomical telescopes in low earth orbit, we will continue to strive for large collecting area and low mass, aiming to overcome disturbances and achieve stable diffraction limited performance with dramatically lower-mass optics. Some applications, such as exoplanet coronagraphs and transit searches, require extremely stable wavefront knowledge and control, coupled with Hubble-class pointing control. Dark energy studies by the weak lensing method also require a very stable wavefront and body pointing control. Many applications will require advanced control of stray light as well. Thus as these future telescopes get lighter and larger, their performance also must dramatically improve. To achieve stability and accuracy, we are beginning to replace the traditional tools of mass and stiffness with optical measurements in closed loop. This will stretch our thinking about methods of building and testing such telescopes.
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