Laser guide stars are an artificial
star image created for use in astronomical adaptive optics imaging. The, by now
classical approach, is to use a narrow-line laser emitting at a sodium
resonance line wavelength to create a yellow artificial “star” in the ~
95 km altitude sodium cloud around the Earth. When working with an
Adaptive Optics system, this beacon provides a bright reference source to
correct atmospheric turbulence in real time in fields devoid of bright enough
natural stars; note however that a moderately bright natural star is still
needed to correct global image motion in the field.
Source & reference:
http://www.eso.org/sci/facilities/develop/lgsf/overview.html
http://en.wikipedia.org/wiki/Laser_guide_star
Animation: ESO's Paranal Observatory projecting a laser into the night sky to create a sodium beacon guide star.
Credit: ESO/Gianluca Lombardi
http://metropolis79.wix.com/glphoto#!galleries/vstc1=astronomy
Source & reference:
http://www.eso.org/sci/facilities/develop/lgsf/overview.html
http://en.wikipedia.org/wiki/Laser_guide_star
Animation: ESO's Paranal Observatory projecting a laser into the night sky to create a sodium beacon guide star.
Credit: ESO/Gianluca Lombardi
http://metropolis79.wix.com/glphoto#!galleries/vstc1=astronomy
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