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Quasi-Bessel beam generated by oblate-tip axicon
- 1.0319125 - ÚPT 2009 RIV US eng C - Conference Paper (international conference)
Brzobohatý, Oto - Čižmár, Tomáš - Zemánek, Pavel
Quasi-Bessel beam generated by oblate-tip axicon.
[Kvazi Besselovské svazky generované axiconem s oblým vrcholem.]
16th Polish-Slovak-Czech Optical Conference on Wave and Quantum Aspects of Contemporary Optics. (Proceedings of SPIE Vol. 7141). Bellingham: SPIE, 2008, 714126: 1-10. ISBN 978-0-8194-7383-7. ISSN 0277-786X.
[Polish-Slovak-Czech Optical Conference on Wave and Quantum Aspects of Contemporary Optics /16./. Polanica Zdrój (PL), 08.09.2008-12.09.2008]
R&D Projects: GA MŠMT(CZ) LC06007; GA MŠMT OC08034; GA MPO FT-TA2/059
Institutional research plan: CEZ:AV0Z20650511
Keywords : Bessel beam * non-diffracting beam * Fourier optics
Subject RIV: BH - Optics, Masers, Lasers
We focused here on the real shape of the tip of the axicon - which is not sharp but rather oblate. We simulated numerically and verified experimentally that tiny deviations of the tip shape from the ideal sharp profile induce significant oscillations of the beam intensity along its propagation. Such unwanted intensity modulation disturbs the unique properties of the quasi-Bessel beam - constant shape of the lateral intensity profile and especially slow variation of the on-axis intensity along the beam propagation. We demonstrate how the spatial filtration of the beam in the Fourier plane removes such undesired modulation and restores the properties of the quasi-Bessel beam.
V příspěvku jsme se soustředili na reálný tvar vrcholu axiconu, který se užívá pro generaci besselovských svazků. Pomocí simulací a experimentů jsme určili, že i malé zaoblení vrcholu axiconu výrazně naruší tvar a unikátní vlastnosti generovaného svazku. Ukázali jsme, že prostorová filtrace svazku ve Fourierově rovině odstranila oscilace v intenzitě svazku způsobené zaoblením vrcholu axiconu.
Permanent Link: http://hdl.handle.net/11104/0168374
Number of the records: 1