title: First on-sky demonstration of the piezoelectric adaptive secondary mirror.
abstract: We propose using a piezoelectric adaptive secondary mirror (PASM) in the medium-sized adaptive telescopes with a 2-4 m aperture for structure and control simplification by utilizing the piezoelectric actuators in contrast with the voice-coil adaptive secondary mirror. A closed-loop experimental setup was built for on-sky demonstration of the 73-element PASM developed by our laboratory. In this Letter, the PASM and the closed-loop adaptive optics system are introduced. High-resolution stellar images were obtained by using the PASM to correct high-order wavefront errors in May 2016. To the best of our knowledge, this is the first successful on-sky demonstration of the PASM. The results show that with the PASM as the deformable mirror, the angular resolution of the 1.8 m telescope can be effectively improved.
authors.forename: Youming
authors.initials: Y
authors.lastname: Guo
authors.forename: Ang
authors.initials: A
authors.lastname: Zhang
authors.forename: Xinlong
authors.initials: X
authors.lastname: Fan
authors.forename: Changhui
authors.initials: C
authors.lastname: Rao
authors.forename: Ling
authors.initials: L
authors.lastname: Wei
authors.forename: Hao
authors.initials: H
authors.lastname: Xian
authors.forename: Kai
authors.initials: K
authors.lastname: Wei
authors.forename: Xiaojun
authors.initials: X
authors.lastname: Zhang
authors.forename: Chunlin
authors.initials: C
authors.lastname: Guan
authors.forename: Min
authors.initials: M
authors.lastname: Li
authors.forename: Luchun
authors.initials: L
authors.lastname: Zhou
authors.forename: Kai
authors.initials: K
authors.lastname: Jin
authors.forename: Junbo
authors.initials: J
authors.lastname: Zhang
authors.forename: Jijiang
authors.initials: J
authors.lastname: Deng
authors.forename: Longfeng
authors.initials: L
authors.lastname: Zhou
authors.forename: Hao
authors.initials: H
authors.lastname: Chen
authors.forename: Xuejun
authors.initials: X
authors.lastname: Zhang
authors.forename: Yudong
authors.initials: Y
authors.lastname: Zhang