Applications of stress-polishing techniques as developed for the Keck  Observatory primary-mirror fabrication

Kris W. Johnson

doi:10.1117/12.51178

13 January 1992 Applications of stress polishing techniques as developed for the Keck Observatory primary mirror fabrication

Kris W. Johnson

Author Affiliations +

Proceedings Volume 1543, Active and Adaptive Optical Components; (1992) https://doi.org/10.1117/12.51178
Event: San Diego, '91, 1991, San Diego, CA, United States

Abstract

The stress polishing technique is a powerful tool for fabrication of off-axis mirror profiles. The inherent smoothness that can be achieved from polishing spheres can now be applied to asymmetric profiles. This smoothness combined with the need for the mirror to be thin and flexible can be coupled to active mounting systems which readily correct low order shapes to produce a near ideal system. This technique will allow the fabrication of complete off-axis telescopes within the same basic cost range as on-axis systems, if not for less. The strength of this statement comes from the fact that both the primary and secondary mirror can be fabricated and mounted using the same techniques, affording less stringent global profile requirements during fabrication. The components are literally bent into final shape with minimal high spacial residual error in the telescope, making the system function at optimum.

Citation Download Citation

Kris W. Johnson "Applications of stress polishing techniques as developed for the Keck Observatory primary mirror fabrication", Proc. SPIE 1543, Active and Adaptive Optical Components, (13 January 1992); https://doi.org/10.1117/12.51178

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