Verification procedure for the wavefront quality of the primary mirrors for the MRO interferometer

Eric J. Bakker; Andres Olivares; Reed A. Schmell; Rodney A. Schmell; Darren Gartner; Anthony Jaramillo; Kelly Romero; Andres Rael; Jeff Lewis

doi:10.1117/12.825429

21 August 2009 Verification procedure for the wavefront quality of the primary mirrors for the MRO interferometer

Eric J. Bakker, Andres Olivares, Reed A. Schmell, Rodney A. Schmell, Darren Gartner, Anthony Jaramillo, Kelly Romero, Andres Rael, Jeff Lewis

Author Affiliations +

Proceedings Volume 7426, Optical Manufacturing and Testing VIII; 74260N (2009) https://doi.org/10.1117/12.825429
Event: SPIE Optical Engineering + Applications, 2009, San Diego, California, United States

Abstract

We present the verification procedure for the 1.4 meter primary mirrors of the Magdalena Ridge Observatory Interferometer (MROI). Six mirrors are in mass production at Optical Surface Technologies (OST) in Albuquerque. The six identical parabolic mirrors will have a radius of curvature of 6300 mm and a final surface wavefront quality of 29 nm rms. The mirrors will be tested in a tower using a computer generated hologram, and the Intellium™ H2000 interferometer from Engineering Synthesis Design, Inc. (ESDI). The mirror fabrication activities are currently in the early stage of polishing and have already delivered some promising results with the interferometer. A complex passive whiffle tree has been designed and fabricated by Advanced Mechanical and Optical Systems (AMOS, Belgium) that takes into account the gravity loading for an alt-alt mount. The final testing of the primary mirrors will be completed with the mirror cells that will be used in the telescopes. In addition we report on shear tests performed on the mirror cell pads on the back of the primary mirrors. These pads are glued to the mirror. The shear test has demonstrated that the glue can withstand at least 4.9 kilo Newton. This is within the requirements.

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Eric J. Bakker, Andres Olivares, Reed A. Schmell, Rodney A. Schmell, Darren Gartner, Anthony Jaramillo, Kelly Romero, Andres Rael, and Jeff Lewis "Verification procedure for the wavefront quality of the primary mirrors for the MRO interferometer", Proc. SPIE 7426, Optical Manufacturing and Testing VIII, 74260N (21 August 2009); https://doi.org/10.1117/12.825429

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