Optimal focusing conditions of lenses using Gaussian beams

OPTICS COMMUNICATIONS

卷:371

Article

Manuel Franco, Juan¹  Cywiak, Moises¹  Cywiak, David²  Mourad, Idir³ 

[1] Ctr Invest Opt AC, Loma Del Bosque 115, Leon, Mexico

[2] Ctr Nacl Metrol, Queretaro 76246, Mexico

[3] Brookhaven Natl Lab, NSLS II 50 Rutherford Dr, Upton, NY 11973 USA

关键词: Best focusing plane;    Focal length;    Focusing lens;    Fresnel number;   

DOI  :  10.1016/j.optcom.2016.03.084

来源: Elsevier

【 摘 要 】

By using the analytical equations of the propagation of Gaussian beams in which truncation exhibits negligible consequences, we describe a method that uses the value of the focal length of a focusing lens to classify its focusing performance. We show that for different distances between a laser and a focusing lens there are different planes where best focusing conditions can be obtained and we demonstrate how the value of the focal length impacts the lens focusing properties. To perform the classification we introduce the term delimiting focal length. As the value of the focal length used in wave propagation theory is nominal and difficult to measure accurately, we describe an experimental approach to calculate its value matching our analytical description. Finally, we describe possible applications of the results for characterizing Gaussian sources, for measuring focal lengths and/or alternatively for characterizing piston-like movements. (C) 2016 Elsevier B.V. All rights reserved.

【 授权许可】

Free