Dynamic higher-order Bessel-Gauss beam interference generation of rotating beams

Gabrielius Kontenis; Darius Gailevičius; Noe Jimenez; Kęstutis Staliūnas

doi:10.1117/12.2621652

24 May 2022 Dynamic higher-order Bessel-Gauss beam interference generation of rotating beams

Gabrielius Kontenis, Darius Gailevičius, Noe Jimenez, Kęstutis Staliūnas

Proceedings Volume 12131, Nanophotonics IX; 121310F (2022) https://doi.org/10.1117/12.2621652
Event: SPIE Photonics Europe, 2022, Strasbourg, France

Abstract

One of the key trends in laser material processing is the usage of structured laser beams. One such example is the Bessel beam with an elongated focal area and self-healing properties. Higher-order Bessel beams can be formed by axicons, spiral phase plates, or equivalently by the phase masks (holograms). In this work, a demonstration of “optical drill” beams with dynamic intensity distributions resembling the spinning mechanical drill is shown. Bessel beam mixing of two different helicities is achieved by using a Spatial Light Modulator (SLM). Both Bessel beams are formed on the same optical component – the phase mask consisting of two parts. Each part consists of spirals with different winding numbers and different periods that correspond to different step plates and axicons. Such a mask forms the stationary optical drill beam. As the beam propagates the outer and inner parts start to overlap and form the resultant interfering beam. Now, to make it a true drill, it must rotate in time. In our experiment, that is achieved by rotating one part of the combined hologram. This induces an angular offset to the interference and as a result, the orientation of the helical intensity pattern starts to rotate in time. This continuous motion gives the impression of an optical drill. With the beams dynamic properties, it could become a new tool in laser material micromachining, as a mechanical drill was to construction.

Conference Presentation

Citation Download Citation

Gabrielius Kontenis, Darius Gailevičius, Noe Jimenez, and Kęstutis Staliūnas "Dynamic higher-order Bessel-Gauss beam interference generation of rotating beams", Proc. SPIE 12131, Nanophotonics IX, 121310F (24 May 2022); https://doi.org/10.1117/12.2621652

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