Physics – Optics
Scientific paper
Sep 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004spie.5494..122b&link_type=abstract
Optical Fabrication, Metrology, and Material Advancements for Telescopes, Edited by E. Atad-Ettedgui and P. Dierickx. Procee
Physics
Optics
Scientific paper
This report describes the equipment, experimental methods, and first results at a new facility at the Goddard Space Flight Center Optics Branch for interferometric measurement of cryogenically-cooled spherical mirrors. A mirror is cooled to 80 K and 20 K within a cryostat; and its surface figure error is measured through a fused-silica window using standard phase-shifting interferometry. The first mirror tested was a concave spherical silicon foam-core mirror with a clear aperture of 120 mm. The optic surface was measured at room temperature outside the dewar using standard "absolute" techniques; and then the change in surface figure error within the dewar from room temperature to 80 K was measured, and the two measurements added to create a representation of the two-dimensional surface figure error at 80 K, with a combined standard uncertainty of 3.4 nm rms. The facility and techniques will be used to measure the surface figure error at 20K of prototype lightweight silicon carbide and Cesic mirrors developed by Galileo Avionica (Italy) for the European Space Agency (ESA).
Blake Peter N.
Chambers John
Content David A.
Davila Pamela
Mink Ronald G.
No associations
LandOfFree
High-accuracy surface figure measurement of silicon mirrors at 80 K does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with High-accuracy surface figure measurement of silicon mirrors at 80 K, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and High-accuracy surface figure measurement of silicon mirrors at 80 K will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1822097