Large-mode-area optical fiber for photonic nanojet generation

The photonic nanojet (PNJ) generated by a shaped optical fiber tip is an attractive technology for laser micro-machining. The working distance has the same order of size as the fiber core diameter; therefore, multimode (MM) fibers are generally preferred. However, the PNJ is due to the fundamental m...

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Veröffentlicht in:Optics letters 2019-05, Vol.44 (10), p.2474-2477
Hauptverfasser: Pierron, Robin, Chabrol, Grégoire, Roques, Stéphane, Pfeiffer, Pierre, Yehouessi, Jean-Paul, Bouwmans, Géraud, Lecler, Sylvain
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container_end_page 2477
container_issue 10
container_start_page 2474
container_title Optics letters
container_volume 44
creator Pierron, Robin
Chabrol, Grégoire
Roques, Stéphane
Pfeiffer, Pierre
Yehouessi, Jean-Paul
Bouwmans, Géraud
Lecler, Sylvain
description The photonic nanojet (PNJ) generated by a shaped optical fiber tip is an attractive technology for laser micro-machining. The working distance has the same order of size as the fiber core diameter; therefore, multimode (MM) fibers are generally preferred. However, the PNJ is due to the fundamental mode and, therefore, the energy coupled on the high-order modes does not contribute to the process. We demonstrate the benefit of a large-mode-area (LMA) optical fiber in the generation of the PNJ. A homemade 40 μm mode field diameter LMA fiber is compared with a 100/140 MM-shaped fiber tip. Similar micro-peaks are obtained, and an energy gain is demonstrated. The coupled energy required was eight times less intense with the LMA fiber, which may open new possibilities for laser micro- and nano-processing.
doi_str_mv 10.1364/OL.44.002474
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subjects Coupled modes
Engineering Sciences
Laser machining
Micromachining
Optical fibers
Optics
Photonic
Photonics
title Large-mode-area optical fiber for photonic nanojet generation
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