11 November 1999 Manufacture of LIGO core optics at CSIRO
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Abstract
The manufacture and testing of the 'core' optical substrates for the Laser Interferometer Gravitational-wave Observatory (LIGO) are described in this paper. These substrates are for use in long baseline Michelson interferometers with Fabry Perot cavities up to 4 km in length in each arm. The optical surfaces of the substrates (250 mm diameter by up to 100 mm thick) are specified either flat or curved, with radii of curvature varying between 7 and 15 km and tolerance bands on the radius equivalent to variations in the sag (over 200 mm) of twenty nanometers or so. Very strict tolerances were also placed on the astigmatism of the surfaces and the surface errors in two spatial frequency bands, one at low frequencies ('waviness') and another at high frequencies ('roughness'). In some cases the radius of the wavefront emerging from the substrate was also specified (for a collimated test beam).
© (1999) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Christopher J. Walsh, Achim J. Leistner, Bozenko F. Oreb, Jeffrey A. Seckold, David I. Farrant, Ronald W. Bulla, Glenn Davis, Phillip J. Lennox, Frank J. Lesha, Edita Pavlovic, Wayne Stuart, Carl M. Sona, Ruimin Yin, "Manufacture of LIGO core optics at CSIRO", Proc. SPIE 3782, Optical Manufacturing and Testing III, (11 November 1999); doi: 10.1117/12.369187; https://doi.org/10.1117/12.369187
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