@inproceedings{891089041eba422a883fdac04f902370,
title = "Latest GLAO results and advancements in laser tomography implementation at the 6.5m MMT telescope",
abstract = "Laser tomography capability using a multi laser guide star (LGS) system is being implemented at the 6.5 m MMT telescope on Mt. Hopkins, AZ. The system uses five range-gated and dynamically refocused Rayleigh laser beacons to sense the atmospheric wavefront aberration. Corrections are then applied to the wavefront using the 336-actuator adaptive secondary mirror of the telescope. So far, the system has demonstrated successful control of ground-layer aberration over a field of view substantially wider than is delivered by conventional adaptive optics. In this paper, we report the latest results from this mode of operation, using for the first time a plate scale on our IR science camera that samples the diffraction scale at the Nyquist limit. We also discuss findings for a reduction in the width of the on-axis point-spread function from 1.07{"} to <0.2{"} in H band and present the progress achieved toward the implementation of laser tomography. This will be attempted by means of a least squares reconstructor, which is obtained using simultaneous measurements of the wavefronts from the LGS and an additional natural guide star.",
keywords = "Adaptive Optics, Ground Layer Adaptive Optics, Laser Tomography, Rayleigh lasers",
author = "Bendek, {Eduardo A.} and Michael Hart and Powell, {Keith B.} and Vidhya Vaitheeswaran and Don McCarthy and Craig Kulesa",
year = "2011",
doi = "10.1117/12.894149",
language = "English (US)",
isbn = "9780819487599",
series = "Proceedings of SPIE - The International Society for Optical Engineering",
booktitle = "Astronomical Adaptive Optics Systems and Applications IV",
note = "Astronomical Adaptive Optics Systems and Applications IV ; Conference date: 21-08-2011 Through 24-08-2011",
}