Measurement of focus and off-axis anisoplanatism using a sodium resonance beacon and binary stars

Michael Lloyd-Hart; Bruce P. Jacobsen; James Roger P. Angel; Richard G. Dekany; Barbara Carter; Walter J. Wild; Edward J. Kibblewhite; James W. Beletic

doi:10.1117/12.176062

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31 May 1994 Measurement of focus and off-axis anisoplanatism using a sodium resonance beacon and binary stars

Michael Lloyd-Hart, Bruce P. Jacobsen, James Roger P. Angel, Richard G. Dekany, Barbara Carter, Walter J. Wild, Edward J. Kibblewhite, James W. Beletic

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Proceedings Volume 2201, Adaptive Optics in Astronomy; (1994) https://doi.org/10.1117/12.176062
Event: 1994 Symposium on Astronomical Telescopes and Instrumentation for the 21st Century, 1994, Kailua, Kona, HI, United States

Abstract

We have obtained the first measurements with a sodium laser beacon of focus anisoplanatism over large aperture, at the Multiple Mirror Telescope. In complementary studies, the atmospheric turbulence at the high altitude and on the large scale responsible for the measured focus anisoplanatism was explored by observations of binary stars of different separations. We confirm the predictions of Kolmogorov theory, and derive an effective height for the turbulence of 5050 m above the telescope. These results confirm that the sodium laser guide star planned for use with the 6.5 m telescope conversion of the MMT in 1996 will allow diffraction limited infrared observations in the H and K bands.

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Michael Lloyd-Hart, Bruce P. Jacobsen, James Roger P. Angel, Richard G. Dekany, Barbara Carter, Walter J. Wild, Edward J. Kibblewhite, and James W. Beletic "Measurement of focus and off-axis anisoplanatism using a sodium resonance beacon and binary stars", Proc. SPIE 2201, Adaptive Optics in Astronomy, (31 May 1994); https://doi.org/10.1117/12.176062

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