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Average intensity and spreading of an elliptical Gaussian beam propagating in a turbulent atmosphere
KTH, Skolan för elektro- och systemteknik (EES), Elektroteknisk teori och konstruktion.
KTH, Skolan för elektro- och systemteknik (EES), Elektroteknisk teori och konstruktion.ORCID-id: 0000-0002-3401-1125
2006 (Engelska)Ingår i: Optics Letters, ISSN 0146-9592, E-ISSN 1539-4794, Vol. 31, nr 5, s. 568-570Artikel i tidskrift (Refereegranskat) 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

Ort, förlag, år, upplaga, sidor
2006. Vol. 31, nr 5, s. 568-570
Nyckelord [en]
laser-beams, z-scan, networks
Nationell ämneskategori
Elektroteknik och elektronik
Identifikatorer
URN: urn:nbn:se:kth:diva-15447DOI: 10.1364/OL.31.000568ISI: 000235532600002Scopus ID: 2-s2.0-33644925880OAI: oai:DiVA.org:kth-15447DiVA, id: diva2:333488
Anmärkning
QC 20100831Tillgänglig från: 2010-08-05 Skapad: 2010-08-05 Senast uppdaterad: 2020-03-05Bibliografiskt granskad
Ingår i avhandling
1. Propagation of some coherent and partially coherent laser beams
Öppna denna publikation i ny flik eller fönster >>Propagation of some coherent and partially coherent laser beams
2006 (Engelska)Doktorsavhandling, sammanläggning (Övrigt vetenskapligt)
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.

Ort, förlag, år, upplaga, sidor
Stockholm: KTH, 2006. s. 67
Serie
Trita-EE, ISSN 1653-5146 ; 2006-20
Nyckelord
: dark hollow beam, elliptical Gaussian beam, flat-topped beam, twisted anisotropic Gaussian Schell-model, partial coherent, propagation, paraxial optical system
Nationell ämneskategori
Elektroteknik och elektronik
Identifikatorer
urn:nbn:se:kth:diva-4034 (URN)91-7178-391-1 (ISBN)
Disputation
2006-06-15, auditorium H1, Teknikringer 33, Stockholm, 10:00
Opponent
Handledare
Anmärkning
QC 20100831Tillgänglig från: 2006-06-02 Skapad: 2006-06-02 Senast uppdaterad: 2010-08-31Bibliografiskt granskad

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