We present on-sky results from the wide field ground-layer adaptive optics (GLAO) system on the University of Hawaii 2.2-meter telescope on Maunakea. We demonstrate improvements in image quality at visible wavelengths under a variety of seeing conditions. We discuss the gains for a variety of figures of merit including the full-width at half-maximum, the equivalent noise area, and the encircled energy diameter. These gains and figures of merit are discussed in the context of our GLAO science cases. In addition, we present the system image quality error budget, measurements of the dominant error terms, and their impact on the delivered focal plane images.

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Mark Chun, Jessica Lu, Olivier Lai, Fatima Abdurrahman, Maxwell Service, Douglas Toomey, Dora Fohring, Christoph Baranec, Yutaka Hayano, and Shin Oya, "On-sky results from the wide-field ground-layer adaptive optics demonstrator 'imaka," Proc. SPIE 10703, Adaptive Optics Systems VI, 107030J (Presented at SPIE Astronomical Telescopes + Instrumentation: June 11, 2018; Published: 10 July 2018); https://doi.org/10.1117/12.2311956.