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

Paper Details

Date Published: 27 February 2019
PDF: 7 pages
Proc. SPIE 10914, Optical Components and Materials XVI, 109140L (27 February 2019); doi: 10.1117/12.2509913
Show Author Affiliations
Marcin Franczyk, Institute of Electronic Materials Technology (Poland)
Dariusz Pysz, Institute of Electronic Materials Technology (Poland)
Konrad Markowski, Warsaw Univ. of Technology (Poland)
Jolanta Lisowska, Institute of Electronic Materials Technology (Poland)
Alicja Anuszkiewicz, Institute of Electronic Materials Technology (Poland)
Rafał Kasztelanic, Institute of Electronic Materials Technology (Poland)
Univ. of Warsaw (Poland)
Tomasz Stefaniuk, Institute of Electronic Materials Technology (Poland)
Univ. of Warsaw (Poland)
Adam Filipkowski, Institute of Electronic Materials Technology (Poland)
Kazimierz Jędrzejewski, Warsaw Univ. of Technology (Poland)
Tomasz Osuch, Warsaw Univ. of Technology (Poland)
National Institute of Telecommunications (Poland)
Ryszard Buczynski, Institute of Electronic Materials Technology (Poland)
Univ. of Warsaw (Poland)


Published in SPIE Proceedings Vol. 10914:
Optical Components and Materials XVI
Shibin Jiang; Michel J. F. Digonnet, Editor(s)

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