Formation of optical needles by Pancharatnam-Berry phase element for laser-induced modifications in transparent materials

P. Gotovski; P. Šlevas; E. Nacius; V. Jukna; S. Orlov; J. Baltrukonis; O. Ulčinas; T. Gertus

doi:10.1117/12.2544925

2 March 2020 Formation of optical needles by Pancharatnam-Berry phase element for laser-induced modifications in transparent materials

P. Gotovski, P. Šlevas, E. Nacius, V. Jukna, S. Orlov, J. Baltrukonis, O. Ulčinas, T. Gertus

Author Affiliations +

Proceedings Volume 11268, Laser-based Micro- and Nanoprocessing XIV; 112681Y (2020) https://doi.org/10.1117/12.2544925
Event: SPIE LASE, 2020, San Francisco, California, United States

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.

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P. Gotovski, P. Šlevas, E. Nacius, V. Jukna, S. Orlov, J. Baltrukonis, O. Ulčinas, and T. Gertus "Formation of optical needles by Pancharatnam-Berry phase element for laser-induced modifications in transparent materials", Proc. SPIE 11268, Laser-based Micro- and Nanoprocessing XIV, 112681Y (2 March 2020); https://doi.org/10.1117/12.2544925

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