13 January 1992 Final surface error correction of an off-axis aspheric petal by ion figuring
Author Affiliations +
The final surface figure error correction of a 1.3 m ULETM frit-bonded, ultra- lightweight, off-axis primary mirror petal was successfully completed using the ion figuring process. The petal was a concave aspheric optical element. Ion figuring is an optical fabrication method that provides highly controlled error correction of previously polished surfaces using a directed, inert and neutralized ion beam to physically sputter material from the optic surface. The surface figure error of the petal following conventional polishing was 5.02 (lambda) p-v, 0.62 (lambda) rms, and was improved to 0.17 (lambda) p-v, 0.015 (lambda) rms in four process (test-ion figure) iterations ((lambda) equals 632.8 nm). A multi-iteration process sequence was selected to address the various surface figure error volume and spatial frequency components and involved applying three different beam removal functions. The benefits of ion figuring a complex shaped optic using multiple figuring-testing iterations were clearly demonstrated.
© (1992) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Lynn N. Allen, John J. Hannon, Richard W. Wambach, "Final surface error correction of an off-axis aspheric petal by ion figuring", Proc. SPIE 1543, Active and Adaptive Optical Components, (13 January 1992); doi: 10.1117/12.51181; https://doi.org/10.1117/12.51181


Polishing of a 6.5 m f 1.25 mirror for the...
Proceedings of SPIE (September 06 1999)
Combining ion figuring and SPSI testing to produce a high...
Proceedings of SPIE (September 08 1995)
In-Process Measurement Of Fast Aspherics
Proceedings of SPIE (April 04 1979)
Bend-And-Polish Fabrication Techniques
Proceedings of SPIE (October 22 1985)
Rapid Fabrication Of Large Aspheric Optics
Proceedings of SPIE (February 21 1986)

Back to Top