Wavefront sensor for millimeter/submillimeter-wave adaptive optics based on aperture-plane interferometry

18 Feb 2021 · Yoichi Tamura, Ryohei Kawabe, Yuhei Fukasaku, Kimihiro Kimura, Tetsutaro Ueda, Akio Taniguchi, Nozomi Okada, Hideo Ogawa, Ikumi Hashimoto, Tetsuhiro Minamidani, Noriyuki Kawaguchi, Nario Kuno, Yohei Togami, Masato Hagimoto, Satoya Nakano, Keiichi Matsuda, Sachiko Okumura, Tomoko Nakamura, Mikio Kurita, Tatsuya Takekoshi, Tai Oshima, Toshikazu Onishi, Kotaro Kohno ·

We present a concept of a millimeter wavefront sensor that allows real-time sensing of the surface of a ground-based millimeter/submillimeter telescope. It is becoming important for ground-based millimeter/submillimeter astronomy to make telescopes larger with keeping their surface accurate. To establish `millimetric adaptive optics (MAO)' that instantaneously corrects the wavefront degradation induced by deformation of telescope optics, our wavefront sensor based on radio interferometry measures changes in excess path lengths from characteristic positions on the primary mirror surface to the focal plane. This plays a fundamental role in planned 50-m class submillimeter telescopes such as LST and AtLAST.

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Wavefront sensor for millimeter/submillimeter-wave adaptive optics based on aperture-plane interferometry

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