GRAVITY upgrade with high-performance grisms with factor >2 enhanced throughput
| Autor: | Guy Perrin, Alejandra Rosales, Christian Straubmeier, Odele Straub, Eckhard Sturm, Laurent Jocou, Frank Eisenhauer, Ekkehard Wieprecht, Karine Perraut, M. Riquelme, O. Pfuhl, Andreas Eckart, Tim de Zeeuw, Jinyi Shangguan, Erich Wiezorrek, M. Bauböck, António Amorim, P. Guajardo, V. Lapeyrere, C. Rau, Martin G. F. Mayer, Kateryna Kravchenko, Takashi Sukegawa, Thomas Ott, Maryam Habibi, Felix Widmann, A. Buron, F. Haussmann, Julia Stadler, Sebastiano von Fellenberg, Sylvestre Lacour, Yukinobu Okura, Wolfgang Brandner, Reinhard Genzel, L. Barl, Senol Yazici, Stefan Gillessen, Feng Gao, Thibaut Paumard, David M. Huber, Paolo Garcia, Laurent Pallanca |
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| Přispěvatelé: | Tuthill, P.G., Mérand, A., Sallum, S. |
| Jazyk: | angličtina |
| Rok vydání: | 2021 |
| Předmět: | |
| Zdroj: | Optical and Infrared Interferometry and Imaging VII, 493-520. SPIE STARTPAGE=493;ENDPAGE=520;TITLE=Optical and Infrared Interferometry and Imaging VII |
| Popis: | During the past years, the VLTI-instrument GRAVITY has made spectacular discoveries with phase-referenced interferometric imaging with milliarcsecond resolution and ten microarcsecond astrometry. Here, we report on the upgrade of the GRAVITY science spectrometer with two new grisms in October 2019, increasing the instrument throughput by a factor > 2. This improvement was made possible by using a high refractive index Germanium substrate, which reduces the grism and groove angles, and by successfully applying an anti-reflection coating to the ruled surface to overcome Fresnel losses. We present the design, manufacturing, and laboratory testing of the new grisms, as well as the results from the re-commissioning on sky. |
| Databáze: | OpenAIRE |
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