3D laser nano-printing on fibre paves the way for super-focusing of multimode laser radiation

Grigorii S. Sokolovskii, Vasileia Melissinaki, Ksenia A. Fedorova, Vladislav V. Dudelev, Sergey N. Losev, Vladislav E. Bougrov, Wilson Sibbett, Maria Farsari, Edik U. Rafailov

Research output: Contribution to journalArticle

Abstract

Multimode high-power laser diodes suffer from inefficient beam focusing, leading to a focal spot 10–100 times greater than the diffraction limit. This inevitably restricts their wider use in ‘direct-diode’ applications in materials processing and biomedical photonics. We report here a ‘super-focusing’ characteristic for laser diodes, where the exploitation of self-interference of modes enables a significant reduction of the focal spot size. This is achieved by employing a conical microlens fabricated on the tip of a multimode optical fibre using 3D laser nano-printing (also known as multi-photon lithography). When refracted by the conical surface, the modes of the fibre-coupled laser beam self-interfere and form an elongated narrow focus, usually referred to as a ‘needle’ beam. The multiphoton lithography technique allows the realisation of almost any optical element on a fibre tip, thus providing the most suitable interface for free-space applications of multimode fibre-delivered laser beams. In addition, we demonstrate the optical trapping of microscopic objects with a super-focused multimode laser diode beam thus rising new opportunities within the applications sector where lab-on-chip configurations can be exploited. Most importantly, the demonstrated super-focusing approach opens up new avenues for the ‘direct-diode’ applications in material processing and 3D printing, where both high power and tight focusing is required.
Original languageEnglish
Article number14618
JournalScientific Reports
Volume8
Issue number1
DOIs
Publication statusPublished - 2 Oct 2018

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printing
laser beams
fibers
semiconductor lasers
lasers
lithography
diodes
exploitation
needles
high power lasers
fiber lasers
sectors
optical fibers
trapping
chips
photonics
interference
photons
configurations
diffraction

Bibliographical note

This article is licensed under a Creative Commons Attribution 4.0 International
License, which permits use, sharing, adaptation, distribution and reproduction in any medium or
format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative
Commons license, and indicate if changes were made. Te images or other third party material in this
article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the
material. If material is not included in the article’s Creative Commons license and your intended use is not permitted
by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the
copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.
© The Author(s) 2018

Cite this

Sokolovskii, G. S., Melissinaki, V., Fedorova, K. A., Dudelev, V. V., Losev, S. N., Bougrov, V. E., ... Rafailov, E. U. (2018). 3D laser nano-printing on fibre paves the way for super-focusing of multimode laser radiation. Scientific Reports, 8(1), [14618 ]. https://doi.org/10.1038/s41598-018-32970-6
Sokolovskii, Grigorii S. ; Melissinaki, Vasileia ; Fedorova, Ksenia A. ; Dudelev, Vladislav V. ; Losev, Sergey N. ; Bougrov, Vladislav E. ; Sibbett, Wilson ; Farsari, Maria ; Rafailov, Edik U. / 3D laser nano-printing on fibre paves the way for super-focusing of multimode laser radiation. In: Scientific Reports. 2018 ; Vol. 8, No. 1.
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Sokolovskii, GS, Melissinaki, V, Fedorova, KA, Dudelev, VV, Losev, SN, Bougrov, VE, Sibbett, W, Farsari, M & Rafailov, EU 2018, '3D laser nano-printing on fibre paves the way for super-focusing of multimode laser radiation', Scientific Reports, vol. 8, no. 1, 14618 . https://doi.org/10.1038/s41598-018-32970-6

3D laser nano-printing on fibre paves the way for super-focusing of multimode laser radiation. / Sokolovskii, Grigorii S.; Melissinaki, Vasileia; Fedorova, Ksenia A.; Dudelev, Vladislav V.; Losev, Sergey N.; Bougrov, Vladislav E.; Sibbett, Wilson; Farsari, Maria; Rafailov, Edik U.

In: Scientific Reports, Vol. 8, No. 1, 14618 , 02.10.2018.

Research output: Contribution to journalArticle

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Sokolovskii GS, Melissinaki V, Fedorova KA, Dudelev VV, Losev SN, Bougrov VE et al. 3D laser nano-printing on fibre paves the way for super-focusing of multimode laser radiation. Scientific Reports. 2018 Oct 2;8(1). 14618 . https://doi.org/10.1038/s41598-018-32970-6