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Propagation of a partially coherent twisted anisotropic Gaussian Schell-model beam 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: Applied Physics Letters, ISSN 0003-6951, E-ISSN 1077-3118, Vol. 89, nr 4Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

Analytical formulas are derived for the propagation of a partially coherent twisted anisotropic Gaussian Schell-model (TAGSM) beam in a turbulent atmosphere. Propagation properties of a TAGSM beam in a turbulent atmosphere are investigated in detail. It is found that a TAGSM beam will become a circular beam in a turbulent atmosphere, and low coherence and larger twist have an effect of anticircularization of the beam spot. The beam spot spreads more rapidly for lower coherence, larger twist, or stronger turbulence.

Ort, förlag, år, upplaga, sidor
2006. Vol. 89, nr 4
Nyckelord [en]
average intensity, laser-beams, space
Nationell ämneskategori
Elektroteknik och elektronik
Identifikatorer
URN: urn:nbn:se:kth:diva-15875DOI: 10.1063/1.2236463ISI: 000239376500017Scopus ID: 2-s2.0-33746627311OAI: oai:DiVA.org:kth-15875DiVA, id: diva2:333917
Anmärkning
QC 20100831Tillgänglig från: 2010-08-05 Skapad: 2010-08-05 Senast uppdaterad: 2020-05-11Bibliografiskt 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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