VPHG-based GRISMs for MIRC-X/MYSTIC at CHARA

Michele Frangiamore; Andrea Bianco; Sorabh Chhabra; Stefan Kraus; John D. Monnier

doi:10.1117/12.3021127

26 August 2024 VPHG-based GRISMs for MIRC-X/MYSTIC at CHARA

Michele Frangiamore, Andrea Bianco, Sorabh Chhabra, Stefan Kraus, John D. Monnier

Author Affiliations +

Proceedings Volume 13100, Advances in Optical and Mechanical Technologies for Telescopes and Instrumentation VI; 131005G (2024) https://doi.org/10.1117/12.3021127
Event: SPIE Astronomical Telescopes + Instrumentation, 2024, Yokohama, Japan

Conference Poster

Abstract

The Center for High Angular Resolution Astronomy (CHARA) has developed and continues to manage an optical interferometric array of six telescopes located on Mount Wilson, California. This interferometer is particularly suited to stellar astrophysics. MIRC-X and MYSTIC beam combiners are two instrumentations of the array. The former is designed to work in the J and H band wavelengths, while the latter is designed to work in the K band. To enhance the spectroscopic capabilities, new GRISMs based on volume phase holographic (VPH) gratings have been designed and manufactured. Two dispersing elements operate in the J band, offering a resolving power of R = 6000 at 1.09 μm and 1.27 μm, while the other two elements work in the K band, providing R = 4000 at 2.17 μm and 2.33 μm. The VPHGs are manufactured employing an innovative process developed at Istituto Nazionale di Astro Fisica (INAF). The prisms for the GRISMs are in CLEARTRAN. The design, manufacturing and assembly of the devices are presented together with the measured performances in terms of diffraction efficiency and diffracted wavefront error.

(2024) Published by SPIE. Downloading of the abstract is permitted for personal use only.

Citation Download Citation

Michele Frangiamore, Andrea Bianco, Sorabh Chhabra, Stefan Kraus, and John D. Monnier "VPHG-based GRISMs for MIRC-X/MYSTIC at CHARA", Proc. SPIE 13100, Advances in Optical and Mechanical Technologies for Telescopes and Instrumentation VI, 131005G (26 August 2024); https://doi.org/10.1117/12.3021127

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