Review of active optics methods in astronomy from x-rays to the infrared
2010
This review on Active Optics Methods presents various concepts of deformable uv, visible and ir telescope optics which
have been mainly developed at the Marseille Observatory - for now 40 years - and other institutes. An optical surface
generated by active optics and spherical figuring is free from high spatial frequency errors i.e. ripple errors. Active
Optics allows applications of new concepts as: stress figuring aspherization processes, variable curvature mirrors, in situ
stressing aspherization processes, under stress replications to generate corrected diffraction gratings, multimode deformable
compensators, and situ control of large telescope optics.
X-ray telescope mirrors could also benefit soon from the enhanced imaging performances of active optics. The 0.5-
1 arcsec spatial resolution of Chandra should be followed up by increased resolution space telescopes. This requires
constructing new grazing-incidence telescopes which will strictly satisfy Abbe's sine condition, i.e. a Chase-VanSpeybroeck
design for the two-mirror case. The recent elaboration of an elasticity theory of weakly conical shells allows reviewing
some potential innovative concepts for the active figuring and in situ control of either monolithic or segmented telescope
mirrors for x-ray astronomy.
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