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    Daylight operation of a sodium laser guide star

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    Author
    Hart, Michael
    Jefferies, Stuart
    Murphy, Neil
    Affiliation
    Univ Arizona, Coll Opt Sci
    Issue Date
    2016-07-27
    Keywords
    sodium laser guide star
    wave-front sensing
    daylight observing
    extremely large telescopes
    thermal infrared
    
    Metadata
    Show full item record
    Publisher
    SPIE-INT SOC OPTICAL ENGINEERING
    Citation
    Michael Hart ; Stuart Jefferies and Neil Murphy " Daylight operation of a sodium laser guide star ", Proc. SPIE 9909, Adaptive Optics Systems V, 99095N (July 27, 2016); doi:10.1117/12.2235080; http://dx.doi.org/10.1117/12.2235080
    Journal
    ADAPTIVE OPTICS SYSTEMS V
    Rights
    © 2016 SPIE.
    Collection Information
    This item from the UA Faculty Publications collection is made available by the University of Arizona with support from the University of Arizona Libraries. If you have questions, please contact us at repository@u.library.arizona.edu.
    Abstract
    We report photometric measurements of a sodium resonance guide star against the daylight sky when observed through a tuned magneto-optical filter (MOF). The MOF comprises a sodium vapor cell in a kilogauss-level magnetic field between crossed polarizers and has a very narrow transmission profile at the sodium D-2 resonance of approximately 0.008 nm. Our observations were made with the 1.5 m Kuiper telescope on Mt. Bigelow, AZ, which has a separately mounted guide star laser projecting a circularly polarized single-frequency beam of approximately 6.5 W at 589.16 nm. Both the beam projector and the 1.5 m telescope were pointed close to zenith; the baseline between them is approximately 5 m. Measurements of the guide star were made on the morning of 2016 March 24 using an imaging camera focused on the beacon and looking through the full aperture of the telescope. The guide star flux was estimated at 1.20x10(6) photon/m(2)/s while at approximately 45 minutes after sunrise, the sky background through the MOF was 1100 photon/m(2)/s/arcsec(2). We interpret our results in terms of thermal infrared observations with adaptive optics on the next generation of extremely large telescopes now being built.
    ISSN
    0277-786X
    DOI
    10.1117/12.2235080
    Version
    Final published version
    Additional Links
    http://proceedings.spiedigitallibrary.org/proceeding.aspx?doi=10.1117/12.2235080
    ae974a485f413a2113503eed53cd6c53
    10.1117/12.2235080
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