Cladding-pumped Er-doped (Yb-free) fibres with Al2O3-SiO2 core highly doped with fluorine

Double-clad Er-doped fibers highly doped with aluminum (up to 3 mol.%) and fluorine (up to 1.5 wt.%) have been fabricated and studied. The fibers have a core numerical aperture of approximately 0.055, which allowed us to achieve a single-mode propagation regime for a fiber core diameter of 35 µm. Th...

Full description

Saved in:
Bibliographic Details
Published in:Laser physics letters 2020-01, Vol.17 (1)
Main Authors: Khudyakov, M M, Yashkov, M V, Lipatov, D S, Abramov, A N, Vechkanov, N N, Bubnov, M M, Bobkov, K K, Guryanov, A N, Likhachev, M E
Format: Article
Language:English
Subjects:
Er-doped fibre
fibre laser
stimulated Brillouin scattering
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:Double-clad Er-doped fibers highly doped with aluminum (up to 3 mol.%) and fluorine (up to 1.5 wt.%) have been fabricated and studied. The fibers have a core numerical aperture of approximately 0.055, which allowed us to achieve a single-mode propagation regime for a fiber core diameter of 35 µm. The possibility of increasing the pump-to-signal conversion efficiency in the L-band using the developed double-clad Er-doped fibers was demonstrated. Utilization of the F-GeO2-Al2O3-SiO2-Er fiber together with a P2O5-Al2O3-SiO2-Er fiber was found to be promising for single-frequency amplifiers because the fibers have negligible overlap of the stimulated Brillouin scattering gain. This feature allowed us to build a cascaded double-clad Er-doped fiber amplifier (two Er-doped fibers of different types were spliced one by one) with a threshold of stimulated Brillouin scattering greater than that of an amplifier based on a single Er-doped fiber with the same net length and pump-to-signal conversion efficiency.
ISSN:1612-2011
1612-202X
DOI:10.1088/1612-202X/ab5d24