Ms. Juliana F. Erhardt Profile

Juliana F. Erhardt

at Univ.-Sternwarte München

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Proceedings Article | 5 October 2023 Poster + Paper

The telescope simulator for the Fraunhofer telescope Wendelstein

J. Erhardt, F. Grupp, H. Kellermann, F. Lang, C. Gössl, F. Kummer, F. Langaßner, U. Hopp, R. Bender

Proceedings Volume 12680, 126801R (2023) https://doi.org/10.1117/12.2676662

KEYWORDS: Telescopes, Device simulation, Calibration, Wavefronts, Cameras, Wavefront errors, Spectrographs, Lenses, Wavefront sensors, Equipment

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The 2.1 m-telescope at Mt.Wendelstein in the German Alps will be equipped with an upgraded multi-focal station, distributing the telescope light of one of the Nasmyth ports to either a high-resolution radial velocity instrument, a Shack-Hartmann wavefront sensor or a three-channel-imager. For feeding calibration light to both, the Shack-Hartmann Sensor and the fiber-fed high-resolution spectrograph, a diffraction-limited telescope simulator is used. This simulator mimics the angular distribution of light (secondary mirror vignetting) of the telescope in order to excite the same modes in the fiber feed as the” real” telescope. This is necessary to allow for m/s calibration by means of an astro frequency comb. As 1 m/s corresponds to about 1/2000 of a 13.5 μm pixel on the R=60000 spectrograph, modal effects are crucial and small changes in the illumination of the fiber have an imprint on the calibration accuracy that can be achieved in simultaneous calibration mode. With this paper we introduce the optical layout of the telescope simulator and its opto-mechanical design, taking into account the space constraints at one of our Nasmyth ports of the telescope. The wavefront performance is verified utilizing a Shack-Hartmann sensor. And it is verified that the system is tolerant to small alignment inaccuracies allowing for a relatively relaxed co-alignment of the telescope simulator and the telescope. Our tests in the laboratory prior to installation of the telescope simulator show small wavefront errors and prove that the optical system of the telescope simulator meets all requirements, including a performance that is diffraction limited (Marechal limit: RMS ⪅ λ/14).

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