Use of an actively stressed lap to polish a 1.8-m f/1 paraboloid.

Details Use of an actively stressed lap to polish a 1.8-m f/1 paraboloid. Use of an actively stressed lap to polish a 1.8-m f/1 paraboloid.

Oct 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988vlti....1..353m&link_type=abstract

ESO Conference on Very Large Telescopes and their Instrumentation, Vol. 1, p. 353 - 361

Computer Science

Mirrors

Scientific paper

The authors describe the principles of polishing large fast aspheric mirrors with a lap that changes its shape continuously to match the mirror surface. Through the application of bending and twisting moments at the edge of the lap, a rigid lap as large as one-third the mirror diameter can be made to maintain a sufficiently accurate fit to an f/1 paraboloid at any position. The authors describe the first application of this stressed-lap method of polishing, using a 2-m computer-controlled polishing machine with a 60-cm stressed lap to polish a 1.8-m f/1 paraboloid.

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