Open AccessNanostructured active and photosensitive silica glass for fiber lasers with built-in Bragg gratings
Author(s) -
Marcin Franczyk,
Tomasz Stefaniuk,
Alicja Anuszkiewicz,
Rafał Kasztelanic,
Dariusz Pysz,
Adam Filipkowski,
Tomasz Osuch,
Ryszard Buczyński
Publication year - 2021
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.413433
Subject(s) - materials science , fiber bragg grating , optics , lasing threshold , fiber laser , phosfos , optoelectronics , laser , grating , core (optical fiber) , fiber , plastic optical fiber , fiber optic sensor , wavelength , composite material , physics
A nanostructured core silica fiber with active and photosensitive areas implemented within the fiber core is demonstrated. The photosensitivity, active and passive properties of the fiber can be independently shaped with this new approach. We show that discrete local doping with active ions in form of nanorods allow to obtain effective laser action as in case of continuous distribution of the ions in the core. Co-existing discrete photosensitive nanostructure of germanium doped silica determine single-mode performance and allow inscription of highly efficient Bragg grating over the entire core area. Each nanostructure do not degrade performance of other one since physical interaction between active and photosensitive areas are removed. As a proof of concept, we have designed and fabricated the nanostructured, ytterbium single-mode silica fiber laser with the Bragg grating inscribed in the entire core area. We demonstrated fiber laser with good quality of generated laser beam (M 2 =1.1) with lasing efficiency of 44% and inscribed Bragg grating with 98.5% efficiency and -18 dB contrast.