Ytterbium-doped nanostructured core silica fiber with built-in Bragg grating for laser applications

M. Franczyk , Dariusz Pysz , Konrad Markowski , Jolanta Lisowska , Alicja Anuszkiewicz , R Kasztelanic , Tomasz Stefaniuk , Adam Filipkowski , Kazimierz Jędrzejewski , Tomasz Osuch , Ryszard Buczyński

Abstract

We report for the first time successful inscription of high reflectivity Bragg grating in nanostructured core active fiber. Nanostructurization of the fiber core allows to separate the active and photosensitive areas and to distribute them all over the core. As a result unfavorable clustering between germanium and ytterbium particles is avoided. The distribution of discrete glass areas with feature size smaller than λ/5 results in effectively continuous refractive index profile of the fiber core. We present a single-mode fiber with built-in Bragg grating for laser application with the core composed of ytterbium and germanium doped silica rods. The core structure is arranged as a regular lattice of 1320 doped with ytterbium and 439 doped with germanium silica glass rods. The average germanium doping level within the core of only 1.1% mol allowed efficient inscription of Bragg grating. The nanostructured core was 8.6 μm and the internal cladding was 112 μm in diameter coated with low index polymer to achieve the double-clad structure. In the first proof-of-concept in the laser setup we achieved 35 % of slope efficiency in relation to launched power for the fiber length of 18 m. The output was single-mode with spectrum width below 1 nm. The maximum output power limited by pumping diode was 2.3 W. The nanostructurization opens new opportunities for development of fibers with a core composed of two or more types of glasses. It allows to control simultaneously the refractive index distribution, the active dopants distribution and photosensitivity distribution in the fiber core.
Author M. Franczyk
M. Franczyk,,
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, Dariusz Pysz
Dariusz Pysz,,
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, Konrad Markowski (FEIT / IT)
Konrad Markowski,,
- The Institute of Telecommunications
, Jolanta Lisowska
Jolanta Lisowska,,
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, Alicja Anuszkiewicz
Alicja Anuszkiewicz,,
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, R Kasztelanic
R Kasztelanic,,
-
, Tomasz Stefaniuk
Tomasz Stefaniuk,,
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, Adam Filipkowski
Adam Filipkowski,,
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, Kazimierz Jędrzejewski (FEIT / PE)
Kazimierz Jędrzejewski,,
- The Institute of Electronic Systems
, Tomasz Osuch (FEIT / PE)
Tomasz Osuch,,
- The Institute of Electronic Systems
et al.`
Pages109140L-1 - 109140L-7
Publication size in sheets0.3
Book Jiang Shibin, Digonnet Michel J. F. (eds.): Proceeding of SPIE 16th Conference on Integrated Optics: Sensors, Sensing Structures, and Methods, Proceedings of SPIE: The International Society for Optical Engineering, vol. 10914, 2019, SPIE – The International Society for Optics and Photonics, ISBN 9781510622722, 242 p.
DOIDOI:10.1117/12.2509913
URL https://www.spiedigitallibrary.org/conference-proceedings-of-spie/10914/109140L/Ytterbium-doped-nanostructured-core-silica-fiber-with-built-in-Bragg/10.1117/12.2509913.full?SSO=1
Languageen angielski
File
109140L.pdf 505.53 KB
Score (nominal)20
ScoreMinisterial score = 20.0, 27-07-2019, MonographChapterAuthor
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