Spectrograph design for the Asgard/BIFROST spectro-interferometric instrument for the VLTI

Bibcode
2022SPIE12183E..0MC
DOI
10.1117/12.2628805
Chhabra, Sorabh; Frangiamore, Michele; Kraus, Stefan; Bianco, Andrea; Garzon, Francisco; Monnier, John; Mortimer, Daniel
Bibliographical reference

Optical and Infrared Interferometry and Imaging VIII

Advertised on:
8
2022
Number of authors
7
IAC number of authors
1
Citations
1
Refereed citations
1
Description
The BIFROST instrument will be the first VLTI instrument optimised for high spectral resolution up to R=25,000 and operate between 1.05 and 1.7 μm. A key component of the instrument will be the spectrograph, where we require a high throughput over a broad bandwidth. In this contribution, we discuss the four planned spectral modes (R=50, R=1000, R=5000, and R=25,000), the key spectral windows that we need to cover, and the technology choices that we have considered. We present our plan to use Volume Phase Holographic Gratings (VPHGs) to achieve a high efficiency > 85%. We present our preliminary optical design and our strategies for wavelength calibration.
Type
Non-refereed

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