RT Journal Article
T1 MEGARA Optics: stain removal in PBM2Y prisms
A1 Aguirre Aguirre, D.
A1 Izazaga Pérez, R.
A1 Villalobos Mendoza, B.
A1 Carrasco, E.
A1 Gil De Paz, Armando
A1 Gallego Maestro, Jesús
A1 Iglesias, J.
AB 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.
PB IOP Publishing Ltd
SN 1742-6588
YR 2017
FD 2017
LK https://hdl.handle.net/20.500.14352/17855
UL https://hdl.handle.net/20.500.14352/17855
LA eng
NO International Congress of Engineering Physics (8th. 2016. Mérida, MÉXICO)
DS Docta Complutense
RD 17 abr 2025