Journal
OPTICS COMMUNICATIONS
Volume 480, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.optcom.2020.126510
Keywords
Bessel beam; Gauss-Bessel beam; Non-diffracting beams; Self-healing; Optical vortex; Structured beam
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Funding
- Science Fund of Sofia University (Bulgaria) [80-10-188/2019]
- Deutsche Forschungsgemeinschaft, Germany [SPP 1840, PA 730/7]
- European Regional Development Fund within the Operational Programme Science and Education for Smart Growth 2014-2020 under the Project CoE National center of mechatronics and clean technologies'' [BG05M2OP001-1.001-0008-C01]
- National program Young scientists and postdoctoral candidates'' of Ministry of Education and Science (Bulgaria)
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The research team demonstrated a novel approach to generate long-range Gauss-Bessel beams by imprinting a vortex in a Gaussian beam and focusing/Fourier-transforming the ring-shaped beam with a lens. This method can achieve divergence angles in the microradian range and Gauss-Bessel beam lengths up to 2.5 m.
Bessel beams are remarkable since they do not diverge. Accordingly, they have numerous applications ranging from precision laser micro-machining to laser particle acceleration. We demonstrate a novel approach for generating long-range Gauss-Bessel beams. A ring-shaped beam is produced by imprinting a vortex with high topological charge in a Gaussian beam. The phase singularities are thereafter removed and the ring-shaped beam focused/Fourier-transformed by a thin lens. This results in a remarkably good realization of a Gauss- Bessel beam. Divergence angles in the microradian range and Gauss-Bessel beam lengths up to 2.5 m behind the focal plane of the lens are demonstrated.
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