GRAVITY upgrade with high-performance grisms with factor >2 enhanced throughput

Senol Yazici; Takashi Sukegawa; Martin Mayer; Frank Eisenhauer; Yukinobu Okura; Karine Perraut; Laurent Jocou; Stefan Gillessen; Frank Haussmann; Alexander Buron; David Huber; Lothar Barl; Kateryna Kravchenko; Oliver Pfuhl; Sylvestre Lacour; Vincent Lapeyrere; Erich Wiezorrek; Thomas Ott; Thibaut Paumard; Jinyi Shangguan; Feng Gao; Christian Straubmeier; Patricia Guajardo; Miguel Riquelme; Laurent Pallanca; Reinhard Genzel; Tim de Zeeuw; Michael Bauböck; Maryam Habibi; Christian Rau; Alejandra Jimenez Rosales; Julia Stadler; Odele Straub; Eckhard Sturm; Sebastiano von Fellenberg; Felix Widmann; Ekkehard Wieprecht; Andreas Eckart; Guy Perrin; Antonio Amorim; Paolo Garcia; Wolfgang Brandner

doi:10.1117/12.2561387

15 January 2021 GRAVITY upgrade with high-performance grisms with factor >2 enhanced throughput

Senol Yazici, Takashi Sukegawa, Martin Mayer, Frank Eisenhauer, Yukinobu Okura, Karine Perraut, Laurent Jocou, Stefan Gillessen, Frank Haussmann, Alexander Buron, David Huber, Lothar Barl, Kateryna Kravchenko, Oliver Pfuhl, Sylvestre Lacour, Vincent Lapeyrere, Erich Wiezorrek, Thomas Ott, Thibaut Paumard, Jinyi Shangguan, Feng Gao, Christian Straubmeier, Patricia Guajardo, Miguel Riquelme, Laurent Pallanca, Reinhard Genzel, Tim de Zeeuw, Michael Bauböck, Maryam Habibi, Christian Rau, Alejandra Jimenez Rosales, Julia Stadler, Odele Straub, Eckhard Sturm, Sebastiano von Fellenberg, Felix Widmann, Ekkehard Wieprecht, Andreas Eckart, Guy Perrin, Antonio Amorim, Paolo Garcia, Wolfgang Brandner

Author Affiliations +

Proceedings Volume 11446, Optical and Infrared Interferometry and Imaging VII; 114461X (2021) https://doi.org/10.1117/12.2561387
Event: SPIE Astronomical Telescopes + Instrumentation, 2020, Online Only

Conference Poster

Abstract

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.

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Senol Yazici, Takashi Sukegawa, Martin Mayer, Frank Eisenhauer, Yukinobu Okura, Karine Perraut, Laurent Jocou, Stefan Gillessen, Frank Haussmann, Alexander Buron, David Huber, Lothar Barl, Kateryna Kravchenko, Oliver Pfuhl, Sylvestre Lacour, Vincent Lapeyrere, Erich Wiezorrek, Thomas Ott, Thibaut Paumard, Jinyi Shangguan, Feng Gao, Christian Straubmeier, Patricia Guajardo, Miguel Riquelme, Laurent Pallanca, Reinhard Genzel, Tim de Zeeuw, Michael Bauböck, Maryam Habibi, Christian Rau, Alejandra Jimenez Rosales, Julia Stadler, Odele Straub, Eckhard Sturm, Sebastiano von Fellenberg, Felix Widmann, Ekkehard Wieprecht, Andreas Eckart, Guy Perrin, Antonio Amorim, Paolo Garcia, and Wolfgang Brandner "GRAVITY upgrade with high-performance grisms with factor >2 enhanced throughput", Proc. SPIE 11446, Optical and Infrared Interferometry and Imaging VII, 114461X (15 January 2021); https://doi.org/10.1117/12.2561387

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