15 July 2008 Active optics and x-ray telescope mirrors
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Abstract
For more than 40 years in Marseille Provence observatories active optics concepts have found many fruitful developments in uv, visible and ir telescope optics. For these wavelength ranges, active optics methods are now widely extended by current use of variable curvature mirrors, in situ aspherization processes, stress figuring apsherization processes, replications of stressed diffraction gratings, and in situ control of large telescope optics. X-ray telescope mirrors will also benefit soon from the enhanced performances of active optics. For instance, the 0.5-1 arcsec spatial resolution of Chandra will be followed up by increased resolution space telescopes which will require the effective construction of more strictly aplanatic grazing-incidence two-mirror systems. In view to achieve a high-resolution imaging with two-mirror grazing-incidence telescope, say, 0.1 arcsec, this article briefly reviews the alternative optical concepts. Next, active optics analysis is investigated with the elasticity theory of shells for the active aspherization and in situ control of monolithic and segmented telescope mirrors for x-ray astronomy. An elasticity theory of weakly conical shells is developed for a first approach which uses a monotonic extension (or retraction) of the shell.
© (2008) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Gérard R. Lemaitre, "Active optics and x-ray telescope mirrors", Proc. SPIE 7011, Space Telescopes and Instrumentation 2008: Ultraviolet to Gamma Ray, 701110 (15 July 2008); doi: 10.1117/12.787798; https://doi.org/10.1117/12.787798
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