Laser beam shape converter using spatially variable waveplate made by nanogratings inscription in fused silica

Gertus, Titas; Michailovaś, Andrejus; Michailovas, Kirilas; Petrauskienė, Virginija

doi:10.1117/12.2075869

Cited by 4 publications

(1 citation statement)

References 23 publications

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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%

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%

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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Modification of transparent materials with ultrashort laser pulses: What is energetically and mechanically meaningful?

Bulgakova

Zhukov

Sonina

et al. 2015

Journal of Applied Physics

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A comprehensive analysis of laser-induced modification of bulk glass by single ultrashort laser pulses is presented which is based on combination of optical Maxwell-based modeling with thermoelastoplastic simulations of post-irradiation behavior of matter. A controversial question on free electron density generated inside bulk glass by ultrashort laser pulses in modification regimes is addressed on energy balance grounds. Spatiotemporal dynamics of laser beam propagation in fused silica have been elucidated for the regimes used for direct laser writing in bulk glass. 3D thermoelastoplastic modeling of material relocation dynamics under laser-induced stresses has been performed up to the microsecond timescale when all motions in the material decay. The final modification structure is found to be imprinted into material matrix already at sub-nanosecond timescale. Modeling results agree well with available experimental data on laser light transmission through the sample and the final modification structure.

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A new beam shaping technique implemented in 260 watt 1 kilohertz repetition rate picosecond pulse amplifier

Adamonis

Aleknavičius

Balickas

et al. 2016

2016 International Conference Laser Optics (LO)

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Laser beam shape converter using spatially variable waveplate made by nanogratings inscription in fused silica

Cited by 4 publications

References 23 publications

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

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

Modification of transparent materials with ultrashort laser pulses: What is energetically and mechanically meaningful?

A new beam shaping technique implemented in 260 watt 1 kilohertz repetition rate picosecond pulse amplifier

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