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Fabrication and testing of 4.2m off-axis aspheric primary mirror of Daniel K. Inouye Solar Telescope
This paper presents the detail fabrication process and metrology applied to the mirror from the grinding to finish, that include extremely stable hydraulic support, IR and Visible deflectometry, Interferometry and Computer Controlled fabrication process developed at the University of Arizona.
In this paper modern metrology systems including Swing-Arm Optical Coordinate Measuring System (SOCMM) which is comparable to Interferometry and a Sub-aperture stitching interferometry scalable to a several meters have been presented. Also a Computer Controlled Fabrication Process which produces extremely fine surface figure and finish has been demonstrated. These most recent development has been applied to the fabrication and testing of 0.9m aspheric convex secondary mirror for the Tokyo Atacama Observatory’s 6.5m telescope and the result has been presented.
This course provides the attendees with solid understanding of theory and useful practical skills for using computer generated holograms for optical testing. The class covers the following topics:
• Computer Generated Holograms - underlying principles, types of CGHs and tradeoffs
• Design of optical test systems that use CGHs for wavefront correction and alignment
• Fabrication methods and limitations for CGHs
• Error analysis for CGH testing
• Methods of aligning and calibrating the optical test system
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