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Highly efficient thulium-doped high-power laser fibers fabricated by MCVD

Highly efficient thulium-doped high-power laser fibers fabricated by MCVD
Highly efficient thulium-doped high-power laser fibers fabricated by MCVD

We report a hybrid process by combining both vapor-phase and solution-doping techniques of rare-earth doped preform fabrication in conjunction with the MCVD technique, in order to fabricate highly efficient Tm-doped laser fibers. The proposed fabrication route takes advantage of co-doping silica with high alumina content through the vapor-phase doping process, which is otherwise difficult to achieve using conventional solution doping technique. In addition, by employing the solution doping method, high-purity thulium halide precursors that have low vapor pressures up to several hundred degree Celsius. These high-purity thulium halide precursors can be used to dope the fiber core region with a high thulium concentration that is optimized for an efficient two-for-one cross-relaxation process for 79xnm diode pumped thulium-doped fiber laser. Fibers fabricated using the hybrid approach show more homogeneous and flat-top dopant profiles, compared with the conventional approach, where both aluminum and thulium are incorporated in the core through solution doping. This will ensure that more doped region will take part in the cross-relaxation process. Superior laser performance with a slope efficiency of >70% in the two-micron band has been demonstrated when diode pumped at ~790nm.

1094-4087
196-201
Ramírez-Martínez, N. J.
3c0182fc-1942-4cf5-973f-72e0cafa7fcd
Núñez-Velázquez, M.
3c102956-ac51-4d02-9fe6-6628557cfbff
Umnikov, A. A.
9b57cc1b-d0f9-4c34-9409-a58ee0f70250
Sahu, J. K.
009f5fb3-6555-411a-9a0c-9a1b5a29ceb2
Ramírez-Martínez, N. J.
3c0182fc-1942-4cf5-973f-72e0cafa7fcd
Núñez-Velázquez, M.
3c102956-ac51-4d02-9fe6-6628557cfbff
Umnikov, A. A.
9b57cc1b-d0f9-4c34-9409-a58ee0f70250
Sahu, J. K.
009f5fb3-6555-411a-9a0c-9a1b5a29ceb2

Ramírez-Martínez, N. J., Núñez-Velázquez, M., Umnikov, A. A. and Sahu, J. K. (2019) Highly efficient thulium-doped high-power laser fibers fabricated by MCVD. Optics Express, 27 (1), 196-201. (doi:10.1364/OE.27.000196).

Record type: Article

Abstract

We report a hybrid process by combining both vapor-phase and solution-doping techniques of rare-earth doped preform fabrication in conjunction with the MCVD technique, in order to fabricate highly efficient Tm-doped laser fibers. The proposed fabrication route takes advantage of co-doping silica with high alumina content through the vapor-phase doping process, which is otherwise difficult to achieve using conventional solution doping technique. In addition, by employing the solution doping method, high-purity thulium halide precursors that have low vapor pressures up to several hundred degree Celsius. These high-purity thulium halide precursors can be used to dope the fiber core region with a high thulium concentration that is optimized for an efficient two-for-one cross-relaxation process for 79xnm diode pumped thulium-doped fiber laser. Fibers fabricated using the hybrid approach show more homogeneous and flat-top dopant profiles, compared with the conventional approach, where both aluminum and thulium are incorporated in the core through solution doping. This will ensure that more doped region will take part in the cross-relaxation process. Superior laser performance with a slope efficiency of >70% in the two-micron band has been demonstrated when diode pumped at ~790nm.

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More information

Accepted/In Press date: 9 December 2018
e-pub ahead of print date: 3 January 2019
Published date: 7 January 2019

Identifiers

Local EPrints ID: 427545
URI: http://eprints.soton.ac.uk/id/eprint/427545
ISSN: 1094-4087
PURE UUID: 7ed5f967-6d90-439d-83bf-4eeabd11cc43
ORCID for N. J. Ramírez-Martínez: ORCID iD orcid.org/0000-0001-8711-792X
ORCID for M. Núñez-Velázquez: ORCID iD orcid.org/0000-0003-0774-3272
ORCID for A. A. Umnikov: ORCID iD orcid.org/0000-0001-6006-5410
ORCID for J. K. Sahu: ORCID iD orcid.org/0000-0003-3560-6152

Catalogue record

Date deposited: 23 Jan 2019 17:30
Last modified: 28 Apr 2022 02:20

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Contributors

Author: N. J. Ramírez-Martínez ORCID iD
Author: A. A. Umnikov ORCID iD
Author: J. K. Sahu ORCID iD

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