Latest GLAO results and advancements in laser tomography implementation at the 6.5m MMT telescope

Details Latest GLAO results and advancements in laser tomography implementation at the 6.5m MMT telescope Latest GLAO results and advancements in laser tomography implementation at the 6.5m MMT telescope

Sep 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011spie.8149e...6b&link_type=abstract

Astronomical Adaptive Optics Systems and Applications IV. Edited by Tyson, Robert K.; Hart, Michael. Proceedings of the SPIE,

Physics

Optics

Scientific paper

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.

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