KEYWORDS: Actuators, Mirrors, Collimation, James Webb Space Telescope, Space telescopes, Near field, Cameras, Wavefronts, Telescopes, Segmented mirrors
Large deployable space telescopes like the James Webb Space Telescope (JWST) may have large errors after deployment that must be corrected in situ. One approach is to correct the errors successively. In this paper, we present a new approach to correct large phase aberrations during the coarse figuring stage of the initial alignment. Intensity data is obtained from multiple planes: pupil plane and additional planes in the nearfield of the pupil plane. The irradiance transport equation is used in a new manner used to estimate the phase aberrations at the pupil. The technique was demonstrated in the lab to estimate phase aberrations approaching 20 waves.
Dispersed fringe sensor (DFS) using broadband point source can unambiguously estimate piston to several hundred microns. We demonstrate a rapid technique to analyze the data from a DFS. The technique is less susceptible to higher order aberrations and returns the average phase difference between two aperture elements.
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