Optical figure testing of prototype mirrors for JPL's precision segmented-reflector program

Eric B. Hochberg

doi:10.1117/12.48834

1 December 1991 Optical figure testing of prototype mirrors for JPL's precision segmented-reflector program

Eric B. Hochberg

Proceedings Volume 1542, Active and Adaptive Optical Systems; (1991) https://doi.org/10.1117/12.48834
Event: San Diego, '91, 1991, San Diego, CA, United States

Abstract

JPL's PSR program is developing enabling technologies for large space telescopes employing segmented optics, and in particular, lightweight, thermally stable mirrors for telescopes operating at sub-mm wavelengths. JPL's vacuum cryointerferometric optical test facility includes a computer-controlled phase shifting interferometer operating at 10.59 microns and laser metrology for measurement of piston and absolute radius of curvature. The optical metrology has been integrated with a large vacuum chamber including a liquid nitrogen shroud capable of radiatively cooling 1.5 meter aperture mirrors down to 150 K. The facility is now being used to characterize prototype mirrors in both their room-temperature 'as-replicated' condition, and under orbital temperature conditions. The performance and limitations of the optical metrology hardware and software components are noted. Representative test results on prototype one meter-class composite mirrors being developed for PSR and related ground-based programs are also presented.

Citation Download Citation

Eric B. Hochberg "Optical figure testing of prototype mirrors for JPL's precision segmented-reflector program", Proc. SPIE 1542, Active and Adaptive Optical Systems, (1 December 1991); https://doi.org/10.1117/12.48834

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