MEGARA: high-precision alignment system for gluing fibers and microlenses

Pérez-Calpena, A.; Sánchez-Blanco, E.; Martínez-Delgado, I.; García-Vargas, M. L.; Arrillaga, X.; Aube, H.; Paz, A. Gil de; Maldonado, Manuel; Gallego, J.; Iglésias-Páramo, J.; Carrasco, E.; Sánchez-Moreno, F. M.; Vı́lchez, J. M.; Cedazo, R.

doi:10.1117/12.2232620

Cited by 7 publications

(10 citation statements)

References 2 publications

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“…The gluing of the microlens arrays with the LCB and MOS fiber mini-bundles had been performed at LICA by FRACTAL S.L.N.E. The gluing task included the precise alignment between fibers and microlens plus the tilt verification of the complete assembly [5]. Once this task was completed, the LCB fiber link was ready to be integrated at the focal plane while the MOS fiber mini-bundles were ready to be integrated with the corresponding robotic positioners.…”

Section: Pointingmentioning

confidence: 99%

MEGARA MOS: where are my positioners and fibers pointing to?

Pérez-Calpena

Mancera

Gómez-Álvarez

et al. 2018

Advances in Optical and Mechanical Technologies for Telescopes and Instrumentation III

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MEGARA is an integral-field and multi-object medium-resolution spectrograph for the GTC 10.4m telescope, which was commissioned on June-August 2017. MEGARA offers two observing modes, the LCB mode, a large central IFU; and a Multi-Object Spectrograph (MOS) mode, composed by 92 robotic positioners carrying 7-fiber minibundles each. This paper presents the models and measurements developed for the alignment between the image of the telescope pupil and the 100-µm fiber cores during the integration and verification at the laboratory. On the one hand, the error in the positioner-minibundles assembly was optimized with the aim of achieving a fiber-to-fiber flux homogeneity better than 10%. On the other hand, the positioner pointing was characterized in order to achieve a pointing precision of 1/5 of the spaxel size (which has been designed to be 0.62 arcsec). The on-sky measurements obtained during the commissioning to verify our laboratory results are also presented.

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Section: Pointingmentioning

confidence: 99%

MEGARA MOS: where are my positioners and fibers pointing to?

Pérez-Calpena

Mancera

Gómez-Álvarez

et al. 2018

Advances in Optical and Mechanical Technologies for Telescopes and Instrumentation III

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“…This is a wide broadband fiber and provides a good FRD. More details are provided elsewhere in this volume 12,13 .…”

Section: Fiber Linkmentioning

confidence: 99%

“…The two units are connected by a total of 1267 optical fibers that are grouped in two 40m-long fiber links 12,13 .…”

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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“…The spectrograph optics is formed by 5-lenses, one of them aspheric and 7-lenses camera. The polishing techniques for MEGARA optics are presented by IzazagaPérez, R., et al [10]. Except for the aspheric all of them were manufactured at INAOE and CIO.…”

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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MEGARA: high-precision alignment system for gluing fibers and microlenses

Cited by 7 publications

References 2 publications

MEGARA MOS: where are my positioners and fibers pointing to?

MEGARA MOS: where are my positioners and fibers pointing to?

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

Performance of MEGARA spectrograph optical elements

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