MEGARA Optics: stain removal in PBM2Y prisms



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Aguirre Aguirre, D. and Izazaga Pérez, R. and Villalobos Mendoza, B. and Carrasco, E. and Gil de Paz, Armando and Gallego Maestro, Jesús and Iglesias, J. (2017) MEGARA Optics: stain removal in PBM2Y prisms. Journal of physics: Conference Series, 792 . ISSN 1742-6588

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MEGARA is the new integral-field and multi-object optical spectrograph for the GTC. For medium and high resolution, the dispersive elements are volume phase holographic gratings, sandwiched between two flat windows and two prisms of high optical precision. The prisms are made of Ohara PBM2Y optical glass. After the prisms polishing process, some stains appeared on the surfaces. For this, in this work is shown the comparative study of five different products (muriatic acid, paint remover, sodium hydroxide, aqua regia and rare earth liquid polish) used for trying to eliminate the stains of the HR MEGARA prisms. It was found that by polishing with the hands the affected area, and using a towel like a kind of pad, and polish during five minutes using rare earth, the stains disappear completely affecting only a 5% the rms of the surface quality. Not so the use of the other products that did not show any apparent result.

Item Type:Article
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International Congress of Engineering Physics (8th. 2016. Mérida, MÉXICO)

Uncontrolled Keywords:Physics; Multidisciplinary
Subjects:Sciences > Physics > Astrophysics
Sciences > Physics > Astronomy
ID Code:43113
Deposited On:06 Jun 2017 14:12
Last Modified:10 Dec 2018 15:04

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