title: Properties of a laser cavity containing an absorbing ring.
abstract: This paper considers the transverse optical properties of an absorbing ring when it is lighted by a symmetrical Laguerre-Gauss beam TEM(p0). It is demonstrated that the insertion of an opaque ring having adequate size inside a diaphragmed laser cavity is able to improve greatly (rate of about 100%) the discrimination between the TEM(00) and the TEM(10) modes, while keeping the diffraction losses unchanged or even decreased.
authors.affiliation: Laboratoire d'Electronique Quantique, Faculté de Physique, Université des Sciences et de la Technologie Houari Boumédiène, B.P. n degrees 32, El Alia, 16111 Algiers, Algeria.
authors.forename: Abdelkrim
authors.initials: A
authors.lastname: Hasnaoui
authors.forename: Kamel
authors.initials: K
authors.lastname: Ait-Ameur