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Proceedings Paper

Polish device for FOCCoS/PFS slit system
Author(s): Antonio Cesar de Oliveira; Ligia Souza de Oliveira; Marcio Vital de Arruda; Lucas Souza Marrara; Leandro Henrique dos Santos; Décio Ferreira; Jesulino Bispo dos Santos; Rodrigo de Paiva Vilaça; Josimar Aparecido Rosa; Laerte Sodré Junior; Claudia Mendes de Oliveira
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Paper Abstract

The Fiber Optical Cable and Connector System, ”FOCCoS”, for the Prime Focus Spectrograph, “PFS”, is responsible for transporting light from the Subaru Telescope focal plane to a set of four spectrographs. Each spectrograph will be fed by a convex curved slit with 616 optical fibers organized in a linear arrangement. The slit frontal surface is covered with a special dark composite, made with refractory oxide, which is able to sustain its properties with minimum quantities of abrasives during the polishing process; this stability is obtained This stability is obtained by the detachment of the refractory oxide nanoparticles, which then gently reinforce gently the polishing process and increase its the efficiency. The surface roughness measured in several samples after high performance polishing was about 0.01 microns. Furthermore, the time for obtaining a polished surface with this quality is about 10 times less than the time required for polishing a brass, glass or ceramic surface of the same size. In this paper, we describe the procedure developed for high quality polishing of this type of slit. The cylindrical polishing described here, uses cylindrical concave metal bases on which glass paper is based. The polishing process consists to use grid sequences of 30μm, 12μm, 9μm, 5μm, 3μm, 1μm and, finally, a colloidal silica on a chemical cloth. To obtain the maximum throughput, the surface of the fibers should be polished in such a way that they are optically flat and free from scratches. The optical fibers are inspected with a microscope at all stages of the polishing process to ensure high quality. The efficiency of the process may be improved by using a cylindrical concave composite base as a substrate suitable for diamond liquid solutions. Despite this process being completely by hand, the final result shows a very high quality.

Paper Details

Date Published: 28 July 2014
PDF: 7 pages
Proc. SPIE 9151, Advances in Optical and Mechanical Technologies for Telescopes and Instrumentation, 915145 (28 July 2014); doi: 10.1117/12.2056047
Show Author Affiliations
Antonio Cesar de Oliveira, Lab. Nacional de Astrofísica (Brazil)
Ligia Souza de Oliveira, Oliveira Instrumentação Óptica Ltda. (Brazil)
Marcio Vital de Arruda, Lab. Nacional de Astrofísica (Brazil)
Lucas Souza Marrara, Oliveira Instrumentação Óptica Ltda. (Brazil)
Leandro Henrique dos Santos, Lab. Nacional de Astrofísica (Brazil)
Décio Ferreira, Lab. Nacional de Astrofísica (Brazil)
Jesulino Bispo dos Santos, Lab. Nacional de Astrofísica (Brazil)
Rodrigo de Paiva Vilaça, Lab. Nacional de Astrofísica (Brazil)
Josimar Aparecido Rosa, Lab. Nacional de Astrofísica (Brazil)
Laerte Sodré Junior, Univ. de São Paulo (Brazil)
Claudia Mendes de Oliveira, Univ. de São Paulo (Brazil)

Published in SPIE Proceedings Vol. 9151:
Advances in Optical and Mechanical Technologies for Telescopes and Instrumentation
Ramón Navarro; Colin R. Cunningham; Allison A. Barto, Editor(s)

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