The high-resolution spectrograph of the 6-m Large Azimuthal Telescope (BTA)

Панчук В.Е., Клочкова В.Г., Юшкин М.В., Найденов И.Д. Спектрограф высокого разрешения 6-метрового телескопа БТА // Оптический журнал. 2009. Т. 76. № 2. С. 42–55.

Panchuk V.E., Klochkova V.G., Yushkin M.V., Naidenov I.D. The high-resolution spectrograph of the 6-m Large Azimuthal Telescope (BTA) [in Russian] // Opticheskii Zhurnal. 2009. V. 76. № 2. P. 42–55.

V. E. Panchuk, V. G. Klochkova, M. V. Yushkin, and I. D. Naĭdenov, "The high-resolution spectrograph of the 6-m Large Azimuthal Telescope (BTA)," Journal of Optical Technology. 76 (2), 87-97 (2009). https://doi.org/10.1364/JOT.76.000087

This paper presents the main parameters and design features of a cross-dispersed quartz diffraction spectrograph permanently mounted on one of the two Nasmyth-focus platforms of the 6-m Large Azimuthal Telescope (BTA). The Nasmyth Echelle Spectrograph is intended for the study of stars with high spectral resolution, R=60000. The spectrograph is equipped with various pre-slit devices (polarization analyzers, an iodine cell, etc.), and image slicers. An active-optics system that stabilizes the position of a star's image on the entrance slit of the spectrograph to within about 0.1″ is mounted in the pre-slit part of the spectrograph. The optical layout of the Nasmyth Echelle Spectrograph is designed to obtain spectra without substantially reducing the spectral resolution in a wide wavelength range λ=300-1000nm. A unique mosaic composed of two echelle gratings is used as the main dispersive element of the spectrograph.