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  • 1
    Electronic Resource
    Electronic Resource
    The ALFA Laser Guide Star: Operation and Results (2000)
    Springer
    Experimental astronomy 10 (2000), S. 103-121 
    Details
    ISSN: 1572-9508
    Keywords: Abell Galaxy Clusters ; adaptive optics ; atmospheric turbulence ; Herbig Ae/Be stars ; laser guide star ; sodium profile
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The importance of laser guide stars to the practical usefulness ofadaptive optics cannot be understated, and yet there are veryfew working systems.This contribution discusses the current status of the ALFAlaser guide star, with regard to the particular difficulties encounteredwhile observing as well as both the expected performance and that so farachieved from scientific observations.A description is given of a number of experiments involving ALFA whichaim to determine the atmospheric turbulence and sodium layercharateristics, and demonstrate the possibility for tilt recovery fromlaser guide stars.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1008165517543
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    The ALFA Laser and Analysis Tools (2000)
    Springer
    Experimental astronomy 10 (2000), S. 75-88 
    Details
    ISSN: 1572-9508
    Keywords: adaptive optics ; laser guide star ; atmospheric turbulence
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The optimal performance of adaptive optics systems can only be maintainedif the wavefront reference is bright and compact.Experience has shown that both of these important criteria are remarkablydifficult to achieve with laser guide stars. This contribution gives an account of the methods by which ALFAattempts to reach them.First, the production of a high quality, high power laser beam isdescribed.However, this quality is unavoidably compromised along the path to thelaunch telescope.In order to rectify this, a new set of diagnostic tools which monitorthe quality of the out-going beam has been installed, and these arealso described.Lastly, we outline a number of possible modifications on which we areworking.If successful, these may allow a substantial improvement in the beamquality.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1008137214239
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    Paper (German National Licenses)
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