Pallotta J. V.¹, Otero L. A.², Ristori P.³, González F.¹, Vilar O.¹, Wolfram E.¹, Etchegoyen A.⁴, Quel E.¹

¹Observatorio Pierre Auger
²Centro de Investigaciones en Láseres y Aplicaciones, CEILAP (CITEFA-CONICET), Becaria CONAE.
³École Polytechnique Fédérale de Lausanne (EPFL) Environmental Fluid Mechanics and
Hydrology Laboratory (EFLUM). Station 2 CH-1015, Lausanne, Switzerland
⁴Laboratorio TANDAR, (CNEA)

The objective of the Pierre Auger Observatory is the study of ultra energetic cosmic rays with energies beyond 1018 eV. For this study, is necessary to know the atmospheric optical thickness from the path of the cosmic ray to the fluorescence detector (FD), and this information is provided by a multiangle LIDAR. The construction of the optics for these LIDARs is a task for the CEILAP (CITEFA-CONICET) laboratory. The design and simulation of this optics was done, and then a prototype was build to test its mechanical stability, since in the focus of the telescope, a optical fiber is placed and the detected light must reach the fiber for the different azimuth and zenithal angles. Also, this system must operate under hard conditions, like wide temperature changes and winds up to 50 Km/h. The results of the simulation and the mechanical stability test are presented, with the shape and size of the spot in the focus of the telescope.