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Proceedings Paper

Formation of optical needles by Pancharatnam-Berry phase element for laser-induced modifications in transparent materials
Author(s): P. Gotovski; P. Šlevas; E. Nacius; V. Jukna; S. Orlov; J. Baltrukonis; O. Ulčinas; T. Gertus
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Paper Abstract

Long focal lines with transverse spot sizes as small as a few wavelengths are called optical needles. A zeroth order Bessel beam being a good example is widely used in such applications as laser micromachining. In practice Bessel beam generated with an axicon has a peak in axial intensity distribution and is not only due to aberrations caused by planar dielectric material interface. Here, we investigate optical needles with controlled axial intensity distribution via intensity modulation of the incoming beam. We have chosen to generate constant axial intensity Bessel beam and propose spatial transmission mask to do so. Experimental verification is presented using diffractive optics elements based on Pancharatnam-Berry phase. We demonstrate a flattening of the axial intensity profile of the Bessel beam without the alteration to the optical needle diameter.

Paper Details

Date Published: 2 March 2020
PDF: 9 pages
Proc. SPIE 11268, Laser-based Micro- and Nanoprocessing XIV, 112681Y (2 March 2020); doi: 10.1117/12.2544925
Show Author Affiliations
P. Gotovski, State Research Institute Ctr. for Physical Sciences and Technology (Lithuania)
P. Šlevas, State Research Institute Ctr. for Physical Sciences and Technology (Lithuania)
Workshop of Photonics (Lithuania)
E. Nacius, State Research Institute Ctr. for Physical Sciences and Technology (Lithuania)
Workshop of Photonics (Lithuania)
V. Jukna, State Research Institute Ctr. for Physical Sciences and Technology (Lithuania)
Light Conversion (Lithuania)
S. Orlov, State Research Institute Ctr. for Physical Sciences and Technology (Lithuania)
J. Baltrukonis, State Research Institute Ctr. for Physical Sciences and Technology (Lithuania)
Workshop of Photonics (Lithuania)
O. Ulčinas, Workshop of Photonics (Lithuania)
T. Gertus, Light Conversion (Lithuania)


Published in SPIE Proceedings Vol. 11268:
Laser-based Micro- and Nanoprocessing XIV
Udo Klotzbach; Akira Watanabe; Rainer Kling, Editor(s)

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