Measurement techniques for large aspheric optics - LOFT, Large ...

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Active system alignment relies on laser tracker • Reference hologram is aligned to Sam. Then it is used to represent Sam. • Laser tracker used to measure locations of Sam, fold sphere, GMT • Fold sphere and GMT actively positioned to ~100 um Laser tracker Sphere Mounted Retroreflector Measures ρ, θ, φ to determine position to ~25 µm J. H. Burge University of Arizona 10
3.75 m fold sphere • UA produced mirror, mounted at the top of the tower • Shape is actively controlled based on surface measurements from the center of curvature Cast in the Mirror Lab spinning oven Polished, measured at the Mirror Lab Coated at Kitt Peak J. H. Burge University of Arizona 11
Page 1 and 2: Measurement techniques for large as
Page 3 and 4: The Giant Magellan Telescope Site i
Page 5 and 6: Key optical testing challenges for
Page 7 and 8: Interferometric surface measurement
Page 9: CGH test of small optics system •
Page 13 and 14: Scanning pentaprism test Uses the
Page 15 and 16: Laser Tracker Plus Guide initial fi
Page 17 and 18: Comparison of Laser Tracker with In
Page 19 and 20: Measurement Principle • SCOTS mea
Page 21 and 22: SCOTS work underway • Large scale
Page 23 and 24: Large Synoptic Survey Telescope 8.4
Page 25 and 26: Null test of M1, M3 Separate interf
Page 27 and 28: TMT optical challenges 3.1-m convex
Page 29 and 30: The European Extremely Large Telesc
Page 31 and 32: E-ELT primary mirror • 42-m f/1 n
Page 33 and 34: CGH Fizeau test for primary mirror
Page 35 and 36: Optical layout for EELT segment tes
Page 37 and 38: Projection marks for aligning test
Page 39 and 40: UA achieved low noise measurements
Page 41 and 42: SOC performance 0.02 0.015 Repeatab
Page 43 and 44: Power (ROC measurement) using spher
Page 45 and 46: Fizeau interferometry for large sec
Page 47 and 48: Data with Coherent Noise
Page 49 and 50: Measurement of large flat mirrors T
Page 51 and 52: UA Fizeau test for TMT tertiary Lay
Page 53: Conclusion • University of Arizon

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