Laser guide star adaptive optics: measuring the sodium column density using a magneto-optical filter

Details Laser guide star adaptive optics: measuring the sodium column density using a magneto-optical filter Laser guide star adaptive optics: measuring the sodium column density using a magneto-optical filter

Apr 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999a%26a...344l..45p&link_type=abstract

Astronomy and Astrophysics, v.344, p.L45-L48 (1999)

Physics

Optics

1

Instrumentation: Adaptive Optics

Scientific paper

A general use of the adaptive optics requires an artificial guide star created by focusing a laser beam tuned to the sodium D_2 line. We propose here a system to monitor the column density of the mesospheric sodium layer which is based on the sodium magneto-optical filter already widely used in solar observations. The principal characteristics of this system are high transmission and high spectral resolution which allow to perform measurements in minutes on a relatively small (e.g. 50 cm diameter) telescope, where the filter can easily mounted due to its compactness.

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