2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/33533I give a brief introduction on gravitational wave laser interferometers, possible detectable sources from the ground and noise in the detectorsLatex, 4 pages. Published in "Relativity and Gravitation in general. Proceedings of the Spanish Relativity Meeting in honour of the 65th birthday of Lluis Bel". Edts. J. Martin, E. Ruiz, F.Atrio and A. Molina; World Scientific, pp. 321-324 (1999)General Relativity and Quantum Cosmologytext