AO4ELT5 Proceedings

First results with 'imaka

Chun, Mark (University of Hawaii)

We present first-light results from 'imaka, the wide-field ground-layer adaptive optics (GLAO) demonstrator on the University of Hawaii 2.2-meter telescope on Maunakea, Hawaii. Natural guide star asterisms with diameters of 10-16 arcminutes were tested. Focal plane images sampling the central $\sim 10'$ show image resolution improvements of a factor of 1.3-2.7 under a variety of seeing conditions and for wavelengths from 0.6 to 1 micron. Analysis of telemetry data from the system confirms that the ground layer is thin ($<$100 m) and that the dominant residual errors are the residual free-atmosphere and the tomographic reconstruction error.

DOI: 10.26698/AO4ELT5.0100- Proceeding PDF

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