Conception of a near-infrared spectrometer for ground-based observations of massive stars

Abstract

Conception of a nearinfrared spectrometer for ground-based observations of massive stars," J. Abstract. In our contribution, we outline the different steps in the design of a fiber-fed spectrographic instrument for stellar astrophysics. Starting from the derivation of theoretical relationships from the scientific requirements and telescope characteristics, the entire optical design of the spectrograph is presented. Specific optical elements, such as a toroidal lens, are introduced to improve the instrument's efficiency. Then the verification of predicted optical performances is investigated through optical analyses, such as resolution checking. Eventually, the star positioning system onto the central fiber core is explained.

NƎSIE: a fiber-fed near-infrared spectrograph for TIGRE telescope

“…The conception and design analyses of NƎSIE were presented in a dedicated previous paper and this contribution focuses on the experimental performances 6,7 . The alignment of the instrument was first carried out in visible light and then checked with near-infrared laser radiation.…”