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Broadband Profiled Eye-Safe Emission of LMA Silica Fiber Doped with Tm3+/Ho3+ Ions

Authors :
Piotr Miluski
Krzysztof Markowski
Marcin Kochanowicz
Marek Łodziński
Wojciech A. Pisarski
Joanna Pisarska
Marta Kuwik
Magdalena Leśniak
Dominik Dorosz
Jacek Żmojda
Tomasz Ragiń
Jan Dorosz
Source :
Materials, Vol 16, Iss 24, p 7679 (2023)
Publication Year :
2023
Publisher :
MDPI AG, 2023.

Abstract

LMA (Large Mode Area) optical fibers are presently under active investigation to explore their potential for generating laser action or broadband emission directly within the optical fiber structure. Additionally, a wide mode profile significantly reduces the power distribution density in the fiber cross-section, minimizing the power density, photodegradation, or thermal damage. Multi-stage deposition in the MCVD-CDT system was used to obtain the structural doping profile of the LMA fiber multi-ring core doped with Tm3+ and Tm3+/Ho3+ layer profiles. The low alumina content (Al2O3: 0.03wt%) results in low refractive index modification. The maximum concentrations of the lanthanide oxides were Tm2O3: 0.18wt % and Ho2O3: 0.15wt%. The double-clad construction of optical fiber with emission spectra in the eye-safe spectral range of (1.55–2.10 µm). The calculated LP01 Mode Field Diameter (MFD) was 69.7 µm (@ 2000 nm, and 1/e of maximum intensity), which confirms LMA fundamental mode guiding conditions. The FWHM and λmax vs. fiber length are presented and analyzed as a luminescence profile modification. The proposed structured optical fiber with a ring core can be used in new broadband optical radiation source designs.

Details

Language :
English
ISSN :
19961944
Volume :
16
Issue :
24
Database :
Directory of Open Access Journals
Journal :
Materials
Publication Type :
Academic Journal
Accession number :
edsdoj.5ee1ce0b85421d8bc8fa6c76eaf852
Document Type :
article
Full Text :
https://doi.org/10.3390/ma16247679