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Average intensity and spreading of an elliptical Gaussian beam propagating in a turbulent atmosphere
KTH, School of Electrical Engineering (EES), Electromagnetic Engineering.
KTH, School of Electrical Engineering (EES), Electromagnetic Engineering.ORCID iD: 0000-0002-3401-1125
2006 (English)In: Optics Letters, ISSN 0146-9592, E-ISSN 1539-4794, Vol. 31, no 5, 568-570 p.Article in journal (Refereed) Published
Abstract [en]

An analytical formula for the average intensity of an elliptical Gaussian beam (EGB) propagating in a turbulent atmosphere is derived. The spreading properties of an EGB in a turbulent atmosphere are studied. It is found that an EGB will eventually become a circular Gaussian beam in a turbulent atmosphere. This interesting phenomenon is quite different from the propagation of an EGB in free space. The evolution properties are closely related to the parameters of the beam and the turbulent atmosphere

Place, publisher, year, edition, pages
2006. Vol. 31, no 5, 568-570 p.
Keyword [en]
laser-beams, z-scan, networks
National Category
Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
URN: urn:nbn:se:kth:diva-15447ISI: 000235532600002Scopus ID: 2-s2.0-33644925880OAI: oai:DiVA.org:kth-15447DiVA: diva2:333488
Note
QC 20100831Available from: 2010-08-05 Created: 2010-08-05 Last updated: 2013-11-19Bibliographically approved
In thesis
1. Propagation of some coherent and partially coherent laser beams
Open this publication in new window or tab >>Propagation of some coherent and partially coherent laser beams
2006 (English)Doctoral thesis, comprehensive summary (Other scientific)
Abstract [en]

In this thesis, we investigate the propagation of some coherent and partially coherent laser beams, including a dark hollow beam (DHB), an elliptical Gaussian beam (EGB), a flat-topped beam and a twisted anisotropic Gaussian Schell-model (TAGSM) beam, through a paraxial optical system or a turbulent atmosphere. Several theoretical models are proposed to describe a DHB of circular or non-circular symmetry. Approximate analytical formulas for a DHB and a partially coherent TAGSM beam propagating through an apertured paraxial optical system are derived based on the generalized Collins formula. Analytical formulas for a DHB, an EGB, a flat-topped beam and a partially coherent TAGSM beam propagating in a turbulent atmosphere are derived in a tensor form based on the extended Huygens-Fresnel integral formula. It is found that after a long propagation distance these beams become circular Gaussian beams in a turbulent atmosphere, and this is quite different from their propagation properties in free space. The conversion of any of these beams to a circular Gaussian beam becomes quicker and the beam spot in the far field spreads more rapidly for a larger structure constant of the turbulent atmosphere, a shorter wavelength and a smaller waist size of the initial beam. Lower coherence and larger twist have a stronger effect of anti-circularization of the beam spot. Our analytical formulas provide a convenient way for studying the propagation of various laser beams through a paraxial optical system or a turbulent atmosphere. The concept of coincidence fractional Fourier transform (FRT) with an incoherent or partially coherent beam is introduced, and the optical system for its implementation is designed. The coincidence FRT is demonstrated experimentally with a partially coherent beam, and the experimental results are consistent with the theoretical results.

Place, publisher, year, edition, pages
Stockholm: KTH, 2006. 67 p.
Series
Trita-EE, ISSN 1653-5146 ; 2006-20
Keyword
: dark hollow beam, elliptical Gaussian beam, flat-topped beam, twisted anisotropic Gaussian Schell-model, partial coherent, propagation, paraxial optical system
National Category
Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
urn:nbn:se:kth:diva-4034 (URN)91-7178-391-1 (ISBN)
Public defence
2006-06-15, auditorium H1, Teknikringer 33, Stockholm, 10:00
Opponent
Supervisors
Note
QC 20100831Available from: 2006-06-02 Created: 2006-06-02 Last updated: 2010-08-31Bibliographically approved

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