The VLT Laser Guide Star

by: S.Guisard/Novapix
Reference: o-vlt01-00106
Date: 2007-12-21

A 50 cm wide yellow laser beam is coming out of Yepun, (UT4) of the Very Large Telescope. It is used to create a yellow artificial star at 95 km of altitude which helps the adaptive optics to measure and correct the atmosphere's blurring effect.

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