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

Publikováno v: Optical and Infrared Interferometry and Imaging VII, 493-520. SPIE
STARTPAGE=493;ENDPAGE=520;TITLE=Optical and Infrared Interferometry and Imaging VII

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

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::959ef24734793dbe49c01a33a1619089
https://hdl.handle.net/1887/3270835

Machined InP immersion grating perfectly covering J-band

Autor: Takashi Sukegawa, Yukinobu Okura

Publikováno v: Advances in Optical and Mechanical Technologies for Telescopes and Instrumentation IV.

Canon succeeded in practical application of InP immersion rating for the first time in the world (Sukegawa et al., 2016). We have developed specialized material for an immersion grating in transmission characteristics and obtained a material comparab

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::549ae52420e7c127a6b4134c48dd2c1d
https://doi.org/10.1117/12.2560444

Multi-functional immersion grating by homemade freeform cutting machine

Autor: Takashi Sukegawa, Yukinobu Okura

Publikováno v: Optifab 2019.

The application fields of Infrared spectroscopy are extremely wide from matter analysis of organisms to environmental observation. In wide-band spectroscopy, a pair of two different dispersive gratings is used. One is a high-order high dispersive gra

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::0be74e7bd44ad3eb9113a3dc7801ccc4
https://doi.org/10.1117/12.2535763

The compactness, high-resolution and high-speed spectroscope for the middle infrared by the machined Germanium immersion grating

Autor: Yukinobu Okura, Takashi Sukegawa

Publikováno v: High-Speed Biomedical Imaging and Spectroscopy IV.

It is not difficult to be able to get a machined immersion grating in the market, and to obtain high spectrum-resolution (λ/Δλ > 200,000) in the middle infrared (3~5 micrometers) any longer. This wavelength region is a part of the molecule fingerp

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::5eaa33e8525b646ab98e3c5c26a9ee3a
https://doi.org/10.1117/12.2510765

Development of compact integral field unit for spaceborne solar spectro-polarimeter

Autor: Saito Kosuke, Y. Suematsu, Yukiya Enokida, Shinobu Ozaki, Saku Tsuneta, Tomonao Nakayasu, Yukinobu Okura, Masatsugu Koyama, Takashi Sukegawa

Publikováno v: International Conference on Space Optics — ICSO 2014.

A 1.5-m class aperture Solar Ultra-violet Visible and IR telescope (SUVIT) and its instruments for the Japanese next space solar mission SOLAR-C [1] are under study to obtain critical physical parameters in the lower solar atmosphere. For the precise

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::289af1cc4bc65cd771a57de8e9a5460e
https://doi.org/10.1117/12.2304257