Cutting and shaping operations for optical glasses

Izazaga-Pérez, Rafael; Aguirre-Aguirre, Daniel; Carrasco-Licea, E.; Percino-Zacarías, M. E.; Granados-Agustín, Fermín; Villalobos-Mendoza, Brenda; López-Hernández, N.; López-Cortés, V.; Quechol-López, J. T.

doi:10.1117/12.2195948

Cited by 1 publication

(1 citation statement)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Different MEGARA subsystems are discussed by Castillo et al [3], Ferrusca et al [4], Ortíz et al [5], García-Vargas et al [6] and Pérez-Calpena et al [7]. Specific processes in the optical fabrication are briefly described by Izazaga et al [8].…”

Section: Introductionmentioning

confidence: 99%

Polishing techniques for MEGARA pupil elements optics

et al. 2016

View full text Add to dashboard Cite

MEGARA (Multi-Espectrógrafo en GTC de Alta Resolución para Astronomía) is the new integral-field and multi-object optical spectrograph for the 10.4m Gran Telescopio Canarias.. It will offer RFWHM ~6,000, 12,000 and 18,700 for the low-, mid-and high-resolution, respectively in the wavelength range 3650-9700Å. .The dispersive elements are volume phase holographic (VPH) gratings, sandwiched between two flat Fused Silica windows of high optical precision in large apertures. The design, based in VPHs in combination with Ohara PBM2Y prisms allows to keep the collimator and camera angle fixed. Seventy three optical elements are being built in Mexico at INAOE and CIO. For the low resolution modes, the VPHs windows specifications in irregularity is 1 fringe in 210mm x 170mm and 0.5 fringe in 190mm x 160mm. for a window thickness of 25 mm. For the medium and high resolution modes the irregularity specification is 2 fringes in 220mm x 180mm and 1 fringe in 205mm x 160mm, for a window thickness of 20mm. In this work we present a description of the polishing techniques developed at INAOE optical workshop to fabricate the 36 Fused Silica windows and 24 PBM2Y prisms that allows us to achieve such demanding specifications. We include the processes of mounting, cutting, blocking, polishing and testing.

show abstract