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19 July 2010 Narrow ion-beam figuring: a new tool to address extreme slopes on small surfaces located near telescope pupils
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Abstract
Advanced shapes can now be produced for the corrective optics placed near a reimaged pupil, or even a deformable mirror surface. These surfaces can be improved and even apodization added to improve contrast. In this paper, we describe a special form of Narrow Ion Beam Figuring (NIBF) developed at L-3 Tinsley. In contrast to existing Ion Beam Figuring (IBF) machining schemes, the FWHM beam width is controlled in a much narrower band while still providing high beam currents.
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Ulrich Mueller, Jeff Stone, Bridget G. Peters, Jay Daniel, Thomas P. Greene, Ruslan Belikov, and Olivier Guyon "Narrow ion-beam figuring: a new tool to address extreme slopes on small surfaces located near telescope pupils", Proc. SPIE 7739, Modern Technologies in Space- and Ground-based Telescopes and Instrumentation, 77390B (19 July 2010); https://doi.org/10.1117/12.857962
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