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Lasers in astronomy

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Figure 1: Distribution of C N 2 with altitude on July 1991 above the Observa- Observa-torio del Roque de los Muchachos, located at 2200m above sea level at La Palma island (Vernin & M˜ unoz-Tu˜ n´on 1992) Left: absolute profile
Figure 2: Sky coverage of an adaptive optical system at an 8m telescope.
Figure 3: Backscat- Backscat-tering processes in the atmosphere. Return photons versus  alti-tude are given, in  arbi-trary units
Figure 4: Energy level diagram of the single valence electron of the sodium atom for the D 2 transition.
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