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Title: Optimal focusing conditions of lenses using Gaussian beams

Authors:
; ; ;
Publication Date:
Research Org.:
Brookhaven National Laboratory (BNL), Upton, NY (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
OSTI Identifier:
1354465
Report Number(s):
BNL-112982-2016-JA
Journal ID: ISSN 0030-4018
DOE Contract Number:
SC00112704
Resource Type:
Journal Article
Resource Relation:
Journal Name: Optics Communications; Journal Volume: 371
Country of Publication:
United States
Language:
English

Citation Formats

Franco, Juan Manuel, Cywiak, Moisés, Cywiak, David, and Mourad, Idir. Optimal focusing conditions of lenses using Gaussian beams. United States: N. p., 2016. Web. doi:10.1016/j.optcom.2016.03.084.
Franco, Juan Manuel, Cywiak, Moisés, Cywiak, David, & Mourad, Idir. Optimal focusing conditions of lenses using Gaussian beams. United States. doi:10.1016/j.optcom.2016.03.084.
Franco, Juan Manuel, Cywiak, Moisés, Cywiak, David, and Mourad, Idir. 2016. "Optimal focusing conditions of lenses using Gaussian beams". United States. doi:10.1016/j.optcom.2016.03.084.
@article{osti_1354465,
title = {Optimal focusing conditions of lenses using Gaussian beams},
author = {Franco, Juan Manuel and Cywiak, Moisés and Cywiak, David and Mourad, Idir},
abstractNote = {},
doi = {10.1016/j.optcom.2016.03.084},
journal = {Optics Communications},
number = ,
volume = 371,
place = {United States},
year = 2016,
month = 7
}
  • 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. In this study, 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 inmore » 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.« less
  • This paper presents an analysis and subsequent discussion of the phenomena of self-focusing of single electromagnetic Gaussian beams and cross-focusing of multiple coaxial beams in fully ionized magnetoplasma, taking into account the Ohmic heating of the electrons by the beams and loss of energy by electrons due to collision with the ions and electronic thermal conduction; the energy gained by ions in collision with the electrons has been equated to the energy lost on account of ionic thermal conduction. It is seen that the inclusion of the ionic thermal conduction reduces self/cross-focusing for high values of the magnetic field ({nu}{submore » e}<<{omega}{sub c}) and enhances the same for low values of the magnetic field ({nu}{sub e}>>{omega}{sub c}); here {nu}{sub e} is the electron collision frequency and {omega}{sub c},{omega}{sub c} are the cyclotron frequencies of electrons and ions, respectively. The wave frequency is assumed to be much higher than the cyclotron frequency of the electrons. The results lead to the conclusion that considerable error occurs by neglecting ionic thermal conduction in a collisional plasma.« less