The aim of Polychromatic Laser Guide Star (PLGS) is to ensure 100 % sky coverage for near-diffraction astronomical observations using Adaptive Optics. The technique proposed by Foy et al. used a double resonance laser excitation of the mesospheric sodium layer with two dependent lasers at 589 nm and 569 nm. This process produced a polychromatic Tip-Tilt Laser Guide Star (TTLGS) at 330 nm and 589.6 nm (D/sub 1/ sodium transition) for the tip-tilt correction and the Laser Guide Star (LGS) at 589 nm (D/sub 2/ sodium transition) for higher order correction. This process is rather complicated because of the need of precise spatial and temporal overlap of the two lasers and separation of chromatic components.


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    Title :

    New method for atmospheric tip-tilt correction: low power UV modeless laser excitation of mesospheric sodium layer


    Contributors:
    Pique, J.P. (author) / Moldovan, I. (author) / Fesquet, V. (author)


    Publication date :

    2005-01-01


    Size :

    229005 byte




    Type of media :

    Conference paper


    Type of material :

    Electronic Resource


    Language :

    English




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