Polishing techniques for MEGARA pupil elements optics

Izazaga-Pérez, Rafael; Carrasco, E.; Aguirre-Aguirre, Daniel; Salas, Alberto Guillen; Paz, A. Gil de; Gallego, J.; Iglesias, Jorge Mario Ortega; Arroyo, J. M.; Hernández, Mario De Los Santos -; López, Nicolás Cardiel; López, Vicente; Quechol, J. T.; Salazar, M. F.; Carballo, C.; Cruz, Eloy; Arriaga, J.; Luz, J. A. De la; Huepa, A.; Jaimes, G. L.; Reyes, Javier Escalera

doi:10.1117/12.2232121

Cited by 3 publications

(3 citation statements)

References 7 publications

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“…The VPHs are inserted in the pupil by means of an insertion mechanism that extracts the VPH from a wheel where up to a total of 11 VPHs can be placed (out of the 6 LR + 10 MR + 2 HR = 18 VPHs built; a number of MR VPHs are still being manufactured), both responsibility of AVS (Spain). More details on the MEGARA spectrograph optical and optomechanical design and manufacturing are given in this same volume 2,3,8,9,10,11,14,15,16,17 . The camera focuses the light onto an E2V 231-84 deep-depleted 4kx4k 15-μm pixels CCD 18 located in a cryostat designed and built by the INAOE 19,20 .…”

Section: Overviewmentioning

confidence: 99%

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MEGARA, the new intermediate-resolution optical IFU and MOS for GTC: getting ready for the telescope

et al. 2016

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MEGARA (Multi-Espectrógrafo en GTC de Alta Resolución para Astronomía) is an optical Integral-Field Unit (IFU)and Multi-Object Spectrograph (MOS) designed for the GTC 10.4m telescope in La Palma that is being built by a Consortium led by UCM (Spain) that also includes INAOE (Mexico), IAA-CSIC (Spain), and UPM (Spain). The instrument is currently finishing AIV and will be sent to GTC on November 2016 for its on-sky commissioning on April 2017. The MEGARA IFU fiber bundle (LCB) covers 12.5x11.3 arcsec 2 with a spaxel size of 0.62 arcsec while the MEGARA MOS mode allows observing up to 92 objects in a region of 3.5x3.5 arcmin 2 around the IFU.The IFU and MOS modes of MEGARA will provide identical intermediate-to-high spectral resolutions (R FWHM~6 ,000, 12,000 and 18,700, respectively for the low-, mid-and high-resolution Volume Phase Holographic gratings) in the range 3700-9800ÅÅ. An x-y mechanism placed at the pseudo-slit position allows (1) exchanging between the two observing modes and (2) focusing the spectrograph for each VPH setup. The spectrograph is a collimator-camera system that has a total of 11 VPHs simultaneously available (out of the 18 VPHs designed and being built) that are placed in the pupil by means of a wheel and an insertion mechanism. The custom-made cryostat hosts a 4kx4k 15-μm CCD. The unique characteristics of MEGARA in terms of throughput and versatility and the unsurpassed collecting are of GTC make of this instrument the most efficient tool to date to analyze astrophysical objects at intermediate spectral resolutions.In these proceedings we present a summary of the instrument characteristics and the results from the AIV phase. All subsystems have been successfully integrated and the system-level AIV phase is progressing as expected.

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Section: Overviewmentioning

confidence: 99%

“…Section 11 provides more details on the status of system AIV and results of the laboratory tests performed during this phase. We refer the reader to other publications in this volume 1,2,3,4,5,6,7,8,9,10,11,12 for further details.…”

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MEGARA, the new intermediate-resolution optical IFU and MOS for GTC: getting ready for the telescope

et al. 2016

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“…P., et al [4]; MEGARA exposure time calculator by Castillo-Morale, A., et al [5]; MEGARA control system by Lefort, B., et al [6]; MEGARA spectrograph mechanics and opto-mechanics in the AIV phase by Maldonado.M., et al [7]; The large MEGARA pupil elements: assembly, tests, and performance by Martínez-Delgado, I., et al [8]; MEGARA: high-precision alignment system for gluing fibers and microlenses by Pérez-Calpena. A., et al [9].…”

Section: Introductionmentioning

confidence: 99%

Performance of MEGARA spectrograph optical elements

et al. 2016

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MEGARA is the new IFU and multiobject spectrograph for Gran Telescopio Canarias. The spectograph will offer spectral resolution Rfwhm~ 6,000, 12,000 and 18,700. Except for the optical fibers and microlenses, the complete MEGARA optical system has been manufactured in Mexico. This includes a field lens, a 5-lenses collimator, a 7-lenses camera and a complete set of volume phase holographic gratings with 36 flat windows and 24 prisms. All these elements are very large and complex, with very efficient antireflection coatings. Here the optical performance of MEGARA collimator and camera lenses and the field lens is presented.

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The Lunar Ultraviolet Observatory (OUL): preparatory optical activities and detector

Gómez de Castro,

Frutos Pastor,

Chávez

et al. 2024

Space Telescopes and Instrumentation 2024: Ultraviolet to Gamma Ray

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The Lunar Ultraviolet Observatory (OUL) is a small instrument designed to map the Earth exosphere, the magnetosphere and the near-Earth space while orbiting the Moon. It can operate either as a flight-alone cubesat mission or as an instrument. The observatory is a small space telescope to be set in Lunar orbit to produce wide field images (10x10 deg 2 ) in narrow and broad bands in the 115-175 nm spectral range. In this presentation, we will describe the results of the on-going tests of critical optical elements.

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Polishing techniques for MEGARA pupil elements optics

Cited by 3 publications

References 7 publications

MEGARA, the new intermediate-resolution optical IFU and MOS for GTC: getting ready for the telescope

MEGARA, the new intermediate-resolution optical IFU and MOS for GTC: getting ready for the telescope

Performance of MEGARA spectrograph optical elements

The Lunar Ultraviolet Observatory (OUL): preparatory optical activities and detector

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