Paranal Impressions: A New Coat for a Large Mirror

Details Paranal Impressions: A New Coat for a Large Mirror Paranal Impressions: A New Coat for a Large Mirror

Jun 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000eso..press..15.&link_type=abstract

ESO Press Release, 06/2000

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Scientific paper

Ensuring a Highly Reflecting Surface
Astronomical mirrors must be regularly coated in order to retain their ability to reflect light efficiently. Otherwise, too many of the sparse and precious photons collected from distant celestial objects may be lost, adversely influencing the observing programmes.
ANTU and KUEYEN, the two first VLT Unit Telescopes to enter into operation did so while construction work was still ongoing at the top of Paranal. During this period, there was unsually much dust in the air, some of which was deposited on the large mirrors of these two telescopes.
It was therefore decided to re-aluminize these mirrors when the work was over. This was done in February and March 2000.
For this delicate operation, the mirror cell with the 22-tonnes, 8.2-m Zerodur mirror is removed from the telescope and wrapped in a protective cover. It is then moved out of the telescope enclosure and placed on a carriage that is hauled down the mountain to the Mirror Maintenance Building (MMB).
Here the old aluminium layer is removed and the mirror is carefully washed, before it is placed in the Coating Tank. A new and clean aluminium layer is deposited by the sputtering technique. After careful checking, the mirror is brought back to the telescope and mounted.
The photos below were obtained at the time when KUEYEN's mirror was undergoing this process.

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