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Atmospheric dispersion correction for the Subaru AO system

Egner, Sebastian; Ikeda, Yuji; Watanabe, Makoto; Hayano, Y.; Golota, T.; Hattori, M.; Ito, M.; Minowa, Y.; Oya, S.; Saito, Y.; Takami, H.; Iye, M.
2010, SPIE
■ アブストラクト
In this paper, we present the science path ADC unit (atmospheric dispersion corrector) for the AO188 Adaptive Optics System of the Subaru Telescope. The AO188 instrument is a curvature-based Adaptive Optics system with 188 subapertures and achieves good correction down to shorter wavelengths like J-band. At these wavelengths, the atmospheric dispersion within the band becomes significant and thus a correction of the atmospheric dispersion is essential to reach diffraction-limited image quality. We give an overview of the requirements, the final optical and mechanical design of the ADC unit, as well as the structure of its control software.