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

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

May 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994spie.2201..284l&link_type=abstract

Proc. SPIE Vol. 2201, p. 284-294, Adaptive Optics in Astronomy, Mark A. Ealey; Fritz Merkle; Eds.

Physics

Optics

Scientific paper

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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