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Short-wavelength, near-diffraction-limited beam, 792 nm cladding pumped efficient thulium-doped fiber laser in a power-scalable fiber design

Short-wavelength, near-diffraction-limited beam, 792 nm cladding pumped efficient thulium-doped fiber laser in a power-scalable fiber design
Short-wavelength, near-diffraction-limited beam, 792 nm cladding pumped efficient thulium-doped fiber laser in a power-scalable fiber design
Thulium-doped fiber lasers (TDFLs) offer a broad 3F43H emission band ~1600-2200 nm. Thanks to "two-for-one" cross-relaxation process in TDFLs [1], that enables to achieve output power > 1 kW at ~2045 nm with 0.79-µm cladding-pumping. Efficient cross-relaxation requires high Tm-concentration (> 3wt%) [1, 2, references therein]. This results in a high core refractive index (thus higher V-number) that degrades the beam quality. It also increases the thermal load per unit length, although this can be reduced by a large cladding-to-core area ratio that increases the absorption length of the fiber. A long fiber also shifts the emission to long wavelengths with more signal re-absorption. For short-wavelength emission the re-absorption must be reduced in some other way, which also ensures adequate total pump absorption. Simplest technique is to reduce the area ratio, but then excessive thermal load or inefficient cross-relaxation (if the Tm-concentration is low to reduce the thermal load per unit length) hampers power-scaling.
Pidishety, S.
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Barua, P.
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Shardlow, P.C.
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Rojas Hernández, P.G.
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Belal, M.
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Feng, Yutong
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Thipparapu, N.K.
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Sahu, J.K.
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Nilsson, J.
f41d0948-4ca9-4b93-b44d-680ca0bf157b
Pidishety, S.
b693fa46-8454-4577-8166-6a8ae2d3f19c
Barua, P.
ab53bdd9-e00f-46b0-b4f4-5ab6534fe8a6
Shardlow, P.C.
9ca17301-8ae7-4307-8bb9-371df461520c
Rojas Hernández, P.G.
0917a31d-ce16-4f07-8baa-c9c79c6f175d
Belal, M.
468117b2-0929-47dc-871c-719fe14a3839
Feng, Yutong
8257a816-5e4a-47bc-8aa2-e364c4d6e21e
Thipparapu, N.K.
a36a2b4c-b75c-4976-a753-b5fab9e54150
Sahu, J.K.
009f5fb3-6555-411a-9a0c-9a1b5a29ceb2
Nilsson, J.
f41d0948-4ca9-4b93-b44d-680ca0bf157b

Pidishety, S., Barua, P., Shardlow, P.C., Rojas Hernández, P.G., Belal, M., Feng, Yutong, Thipparapu, N.K., Sahu, J.K. and Nilsson, J. (2019) Short-wavelength, near-diffraction-limited beam, 792 nm cladding pumped efficient thulium-doped fiber laser in a power-scalable fiber design. 2019 Conference on Lasers and Electro-Optics Europe and European Quantum Electronics Conference, CLEO/Europe-EQEC 2019, ICM – International Congress Centre, Germany. 22 - 26 Jun 2019. 1 pp . (doi:10.1109/CLEOE-EQEC.2019.8872273).

Record type: Conference or Workshop Item (Poster)

Abstract

Thulium-doped fiber lasers (TDFLs) offer a broad 3F43H emission band ~1600-2200 nm. Thanks to "two-for-one" cross-relaxation process in TDFLs [1], that enables to achieve output power > 1 kW at ~2045 nm with 0.79-µm cladding-pumping. Efficient cross-relaxation requires high Tm-concentration (> 3wt%) [1, 2, references therein]. This results in a high core refractive index (thus higher V-number) that degrades the beam quality. It also increases the thermal load per unit length, although this can be reduced by a large cladding-to-core area ratio that increases the absorption length of the fiber. A long fiber also shifts the emission to long wavelengths with more signal re-absorption. For short-wavelength emission the re-absorption must be reduced in some other way, which also ensures adequate total pump absorption. Simplest technique is to reduce the area ratio, but then excessive thermal load or inefficient cross-relaxation (if the Tm-concentration is low to reduce the thermal load per unit length) hampers power-scaling.

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More information

Published date: 17 October 2019
Venue - Dates: 2019 Conference on Lasers and Electro-Optics Europe and European Quantum Electronics Conference, CLEO/Europe-EQEC 2019, ICM – International Congress Centre, Germany, 2019-06-22 - 2019-06-26

Identifiers

Local EPrints ID: 441944
URI: http://eprints.soton.ac.uk/id/eprint/441944
PURE UUID: 0ca2533f-6506-43ea-859b-3cf80cb820b8
ORCID for P.C. Shardlow: ORCID iD orcid.org/0000-0003-0459-0581
ORCID for Yutong Feng: ORCID iD orcid.org/0000-0002-6839-2106
ORCID for N.K. Thipparapu: ORCID iD orcid.org/0000-0002-5153-4737
ORCID for J. Nilsson: ORCID iD orcid.org/0000-0003-1691-7959

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Date deposited: 02 Jul 2020 16:35
Last modified: 07 Oct 2020 08:01

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Contributors

Author: S. Pidishety
Author: P. Barua
Author: P.C. Shardlow ORCID iD
Author: M. Belal
Author: Yutong Feng ORCID iD
Author: N.K. Thipparapu ORCID iD
Author: J.K. Sahu
Author: J. Nilsson ORCID iD

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