SAMOP 2023 – scientific programme

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Q: Fachverband Quantenoptik und Photonik

Q 40: Photonics II

Q 40.6: Talk

Wednesday, March 8, 2023, 15:45–16:00, F442

Creation of Gauss-Bessel quasi-nondiffracting beams using Optical Vortices — •Maya Zhekova, Nikolay Dimitrov, and Alexander Dreischuh — Sofia University "St. Kliment Ohridski", Faculty of Physics

In recent years a way of creating Gauss-Bessel quasi-nondiffracting beams (GBBs) has been investigated, using optical vortices (OVs), which have been created and later annihilated. In and behind the focus of a thin lens, the resulting beam turns out to be such GBB. Different setups using spiral vortex plates (VPs) have been investigated, but their seemingly main weakness is the wavelength usage limited to the design wavelength of the VPs.

A novel scheme for laser beam shaping has been proposed and investigated, which is applicable in a wide range of wavelengths. The setup's key OV element is a single VP designed for 532 nm, which will be proven to transform beams at 445 nm, 532 nm, 633 nm and 800 nm into GBBs. We will show that this setup can transform beams into not only zeroth-order GB beams. In the case when a residual topological charge is left, the resulting beam will be a first-order Gauss-Bessel beam, again with a lack of spectral sensitivity.