Effects of small misalignments on the intensity and Strehl ratio for a laser beam focused by an off-axis parabola
Authors: Labate L., Ferrara P., Fulgentini L., Gizzi L.A.
Autors Affiliation: Istituto Nazionale di Ottica, Consiglio Nazionale Delle Ricerche, via Moruzzi 1, Pisa, 56124, Italy; Istituto Nazionale di Fisica Nucleare, Sezione di Pisa, largo B. Pontecorvo 3, Pisa, 56127, Italy
Abstract: A general procedure is described to calculate the intensity and Strehl ratio, at a generic plane in the focal region, of a beam focused by an off-axis parabolic mirror in the presence of small misalignments. The general theoretical framework is first developed, which allows a full vector diffraction treatment in the case of general misalignments. Then, a parametric numerical study is reported, aimed at highlighting the tolerances of both the intensity and Strehl ratio for small misalignments, for different focusing and off-axis parabola parameters. A set of experimental measurements aimed at validating the theoretical model is also discussed.
Journal/Review: APPLIED OPTICS
Volume: 55 (23) Pages from: 6506 to: 6515
More Information: Regione Toscana, 0000745. College of Natural Resources, University of California Berkeley, CNR, PRIN2012AY5LEL. European Geosciences Union, EGU, 653782-EuPRAXIA. GR-2009-1608935 D.I. AgeNaS. – Italian Ministry of Health (GR-2009-1608935 D.I. AgeNaS); CNR; PRIN (PRIN2012AY5LEL); MIUR-FIRB (SPARX); INFN gResist and Plasma-med collaborations; Regione Toscana 09/03/2012 (protocollo ISTI-CNR No 0000745); European Union (653782-EuPRAXIA)KeyWords: Laser beams; Off-axis parabolic mirrors; Strehl Ratio; Theoretical framework; Theoretical modeling; AlignmentDOI: 10.1364/AO.55.006506