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Multiple spot mirrors as total reflectors inside stable XeCl laser cavities

TitleMultiple spot mirrors as total reflectors inside stable XeCl laser cavities
Publication TypePresentazione a Congresso
Year of Publication2003
AuthorsRizzo, A., Aghamkar P., de Tomasi F., Perrone M.R., Protopapa Maria Lucia, and Scaglione S.
Conference NameProceedings of SPIE - The International Society for Optical Engineering
Conference LocationFirenze
KeywordsAntireflection coatings, chlorine, Cryopump, Kaufman ion guns, Laser beams, Laser resonators, Mirrors, Optical characterization, Optical coatings, Optical devices, Optical fiber fabrication, Sputtering, Xenon
Abstract

Multiple spot mirrors are non-conventional optical components which present a number of equally spaced circular spots with a high reflectance that decreases to zero outside the spots. It is believed that the use of multiple spot mirrors as full reflectors in plane-parallel laser cavities should allow to improve the laser beam optical quality and get a good filling of the active medium. A double-spot mirror and a four-spot mirror for a XeCl laser cavity (λ=308 nm) have been fabricated by depositing HfO2 and SiO2 thin films by reactive ion beam sputtering. The design employed allows to obtain a maximum reflectance (79%) on the spot area and a reflectance lower than 0.5% outside the spots by shaping the thickness of one of the inner layer. To this aim, a properly shaped mask was put inside the vacuum chamber during the deposition of the graded layer. The realization and the optical characterization of these devices are presented in this paper.

URLhttps://www.scopus.com/inward/record.uri?eid=2-s2.0-2342459728&doi=10.1117%2f12.527568&partnerID=40&md5=61c5c070cbd780dcb004a962a56e4d89
DOI10.1117/12.527568
Citation KeyRizzo2003678