Characterizing the cross dispersion reflection gratings of CRIRES+

Paper


Follert, Roman, Taubert, Dieter, Hollandt, Joerg, Monte, Christian, Oliva, Ernesto, Seemann, Ulf, Loewinger, Tom, Anwand-Heerwart, Heiko, Schmidt, Christof, Dorn, Reinhold J., Bristow, Paul, Hatzes, Artie, Reiners, Ansgar, Piskunov, Nikolai, Heiter, Ulrike, Stempels, Eric, Marquart, Thomas, Lavail, Alexis, Cumani, Claudio, ..., Tordo, Sebastien. 2016. "Characterizing the cross dispersion reflection gratings of CRIRES+." SPIE - Ground-based and Airborne Instrumentation for Astronomy. United States. SPIE. https://doi.org/10.1117/12.2232569
Paper/Presentation Title

Characterizing the cross dispersion reflection gratings of CRIRES+

Presentation TypePaper
AuthorsFollert, Roman, Taubert, Dieter, Hollandt, Joerg, Monte, Christian, Oliva, Ernesto, Seemann, Ulf, Loewinger, Tom, Anwand-Heerwart, Heiko, Schmidt, Christof, Dorn, Reinhold J., Bristow, Paul, Hatzes, Artie, Reiners, Ansgar, Piskunov, Nikolai, Heiter, Ulrike, Stempels, Eric, Marquart, Thomas, Lavail, Alexis, Cumani, Claudio, Grunhut, Jason, Haimerl, Andreas, Hinterschuster, Renate, Ives, Derek J., Jung, Yves, Kerber, Florian, Klein, Barbara, Lizon, Jean Louis, Molina-Conde, Ignacio, Nicholson, Belinda, Origlia, Livia, Pasquini, Luca, Paufique, Jerome, Stegmeier, Joerg and Tordo, Sebastien
Journal or Proceedings TitleProceedings of SPIE (International Society for Optical Engineering)
ERA Conference ID80401
Journal Citation9912
Article Number99122B
Number of Pages11
Year2016
PublisherSPIE
Place of PublicationUnited States
ISSN0277-786X
ISBN9781510602045
Digital Object Identifier (DOI)https://doi.org/10.1117/12.2232569
Web Address (URL) of Paperhttps://www.spiedigitallibrary.org/conference-proceedings-of-spie/9912/1/Characterizing-the-cross-dispersion-reflection-gratings-of-CRIRES/10.1117/12.2232569.short
Web Address (URL) of Conference Proceedingshttps://www.spiedigitallibrary.org/conference-proceedings-of-spie/9912.toc
Conference/EventSPIE - Ground-based and Airborne Instrumentation for Astronomy
Event Details
SPIE - Ground-based and Airborne Instrumentation for Astronomy
Abstract

The CRIRES+ project attempts to upgrade the CRIRES instrument into a cross dispersed Echelle spectrograph with a simultaneous recording of 8-10 diffraction orders. In order to transform the CRIRES spectrograph into a cross-dispersing instrument, a set of six reflection gratings, each one optimized for one of the wavelength bands CRIRES+ will operate in (YJHKLM), will be used as cross dispersion elements in CRIRES+. Due to the upgrade nature of the project, the choice of gratings depends on the fixed geometry of the instrument. Thus, custom made gratings would be required to achieve the ambitious design goals. Custom made gratings have the disadvantage, though, that they come at an extraordinary price and with lead times of more than 12 months. To mitigate this, a set of off-the-shelf gratings was obtained which had grating parameters very close to the ones being identified as optimal. To ensure that the rigorous specifications for CRIRES+ will be fulfilled, the CRIRES+ team started a collaboration with the Physikalisch-Technische Bundesanstalt Berlin (PTB) to characterize gratings underconditions similar to the operating conditions in CRIRES+ (angle of incidence, wavelength range).
The respective test setup was designed in collaboration between PTB and the CRIRES+ consortium. The PTB provided optical radiation sources and calibrated detectors for each wavelength range. With this setup, it is possible to measure the absolute efficiency of the gratings both wavelength dependent and polarization state dependent in a wavelength range from 0.9 μm to 6 μm.

KeywordsCRIRES+; echelle spectrograph; infrared instrumentation; VLT; diffraction efficiency
Contains Sensitive ContentDoes not contain sensitive content
ANZSRC Field of Research 2020510109. Stellar astronomy and planetary systems
Public Notes

© 2016 Society of Photo‑Optical Instrumentation Engineers (SPIE). One print or electronic copy may be made for personal use only. Systematic reproduction and distribution, duplication of any material in this publication for a fee or for commercial purposes, and modification of the contents of the publication are prohibited.

Byline AffiliationsKarl Schwarzschild Observatory, Germany
National Metrology Institute of Germany, Germany
European Organisation for Astronomical Research, Germany
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