Development and optical performance tests of the Si immersed grating demonstrator for E-ELT METIS

Conference paper (2017)

Authors

R. Navarro Netherlands Institute for Radio Astronomy (ASTRON)
Tibor Agocs Netherlands Institute for Radio Astronomy (ASTRON)
L Venema Netherlands Institute for Radio Astronomy (ASTRON)
A.H. van Amerongen SRON Netherlands Institute for Space Research
M. Rodenhuis Universiteit Leiden
Ruud W. M. Hoogeveen SRON Netherlands Institute for Space Research
T Coppens SRON Netherlands Institute for Space Research
B.R. Brandl SRON Netherlands Institute for Space Research, Astrodynamics & Space Missions - Aerospace Engineering
R Vink European Space Agency (ESA)
Research Group
Astrodynamics & Space Missions (Aerospace Engineering) (TU Delft)
Copyright: © 2017 R. Navarro, Tibor Agócs, L Venema, A.H. van Amerongen, M. Rodenhuis, Ruud W. M. Hoogeveen, T Coppens, B.R. Brandl, R. Vink
DOI
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https://doi.org/10.1117/12.2296128
More Info
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Published Date

2017

Language

English

Faculty

Aerospace Engineering

Department

Space Engineering

Research Group

Astrodynamics & Space Missions

Abstract


Immersed gratings offer several advantages over conventional gratings: more compact spectrograph designs, and by using standard semiconductor industry techniques, higher diffraction-efficiency and lower stray-light can be achieved. We present the optical tests of the silicon immersed grating demonstrator for the Mid-infrared E-ELT Imager and Spectrograph, METIS. We detail the interferometric tests that were done to measure the wavefront-error and present the results of the throughput and stray-light measurements. We also elaborate on the challenges encountered and lessons learned during the immersed grating demonstrator test campaign that helped us to improve the fabrication processes of the grating patterning on the wafer.