@inproceedings{aa69e2a9358945bba14affcf185f59fe,
title = "Progress in manufacturing the first 8.4 m off-axis segment for the Giant Magellan Telescope",
abstract = "The first of the 8.4 m off-axis segments for the primary mirror of the Giant Magellan Telescope is being manufactured at the Steward Observatory Mirror Lab. In addition to the manufacture of the segment, this project includes the development of a complete facility to make and measure all seven segments. We have installed a new 28 m test tower and designed a set of measurements to guide the fabrication and qualify the finished segments. The first test, a laser-tracker measurement of the ground surface, is operational. The principal optical test is a full-aperture interferometric test with a null corrector that includes a 3.75 m spherical mirror, a smaller sphere, and a computer-generated hologram. We have also designed a scanning pentaprism test to validate the measurement of low-order aberrations. The first segment has been cast and generated, and is in the process of loose-abrasive grinding.",
keywords = "Active optics, Aspheres, Optical fabrication, Optical testing, Telescopes",
author = "Martin, {H. M.} and Burge, {J. H.} and B. Cuerden and Davison, {W. B.} and Kingsley, {J. S.} and Kittrell, {W. C.} and Lutz, {R. D.} and Miller, {S. M.} and C. Zhao and T. Zobrist",
year = "2008",
doi = "10.1117/12.789805",
language = "English (US)",
isbn = "9780819472281",
series = "Proceedings of SPIE - The International Society for Optical Engineering",
booktitle = "Advanced Optical and Mechanical Technologies in Telescopes and Instrumentation",
note = "Advanced Optical and Mechanical Technologies in Telescopes and Instrumentation ; Conference date: 23-06-2008 Through 28-06-2008",
}