Design of efficient Gauss to top-hat converters using geometrical phase elements inscribed in the glass by femtosecond laser pulses

Gotovski, Pavel; Šlevas, Paulius; Nacius, Ernestas; Jukna, Vytautas; Orlov, Sergej; Ulčinas, Orestas; Baltrukonis, J. H.; Gertus, Titas

doi:10.1117/12.2546620

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2022

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“…The local geometrical phase is usually referred to as the Pancharatnam-Berry phase (PBP) [3,4]. The PBP element finds its use in many areas such as metalenses with high numerical aperture [5], or special optics transforming the beam intensity to a top-hat beam [6][7][8]. Advancements in the fields of lithography, laser * Author to whom any correspondence should be addressed.…”

Section: Introductionmentioning

confidence: 99%

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Investigation of the Pancharatnam–Berry phase element for the generation of the top-hat beam

Gotovski¹,

Šlevas²,

Orlov³

et al. 2022

J. Opt.

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Within optics, the Pancharatnam-Berry phase enables the design and creation of various flat special optical elements such as top-hat converters. We present a study on engineering efficient vectorial top-hat converters inscribed in glass by high-power femtosecond laser pulses. We phase-encode a top-hat converter and demonstrate how its quality is influenced by various parameters. We investigate theoretically the generation of the top-hat beam under imperfect conditions such as the mismatch of the incident beam width or the misalignment of the center of the converter. Experimental verification of the concept is also presented.

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Section: Introductionmentioning

confidence: 99%

“…However, additional system complexity and costs are introduced [59,60]. In our previous work, we have proposed a new approach to generate top-hat beams via GPOE that enables a reduction of the number of optical elements in the scheme [8]. This element is based on transmittance (i.e.…”

Section: Introductionmentioning

confidence: 99%