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Liquid-nitrogen-cooled high-concentration erbium-doped fibre laser

Liquid-nitrogen-cooled high-concentration erbium-doped fibre laser
Liquid-nitrogen-cooled high-concentration erbium-doped fibre laser
Erbium-doped fibres suffer from quenching at high Er-concentrations. We have found that cryo-cooling to liquid-nitrogen temperature (LNT) substantially improves both the threshold and slope efficiency of a heavily doped, partly quenched, erbium-doped fibre laser (EDFL). The fibre is fabricated in-house by a heated-frit method, a technique suitable for gas-phase deposition of rare-earth doped fibre. It has an Er-concentration of ~8300 ppm (wt.) in a 10 µm diameter, 0.13 NA aluminosilicate core. It was characterised in a ring laser setup with an outcoupled signal of 3 dB. In the outcoupling we include the loss of an attenuator, two tap couplers, an extra isolator, and a connector pair inserted into the cavity for experimental convenience. The 1 m doped fibre was counter-pumped in the core at 1480 nm with negligible pump leakage. Figure 1 shows the resulting laser power at LNT and RT (room temperature), calculated as the difference between the circulating power after and before amplification in the EDF. The LNT case shows clear improvements in both threshold and slope efficiency, the latter reaching 38.6%. The emission wavelength shifts from 1592 nm at RT to1572 nm at LNT.
Steinborn, R.
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Yao, T.F.
efa8c962-4cd3-426a-801c-4ab9a8196503
Webb, A.
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Sahu, J.K.
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Nilsson, J.
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Steinborn, R.
bd91f292-e887-4847-a098-8cd6e87c4272
Yao, T.F.
efa8c962-4cd3-426a-801c-4ab9a8196503
Webb, A.
340dabef-1825-423a-98b1-5dfd067fe181
Sahu, J.K.
009f5fb3-6555-411a-9a0c-9a1b5a29ceb2
Nilsson, J.
f41d0948-4ca9-4b93-b44d-680ca0bf157b

Steinborn, R., Yao, T.F., Webb, A., Sahu, J.K. and Nilsson, J. (2011) Liquid-nitrogen-cooled high-concentration erbium-doped fibre laser. European Conference on Lasers and Electro-Optics (CLEO-Europe/EQEC 2011), Germany. 22 - 26 May 2011.

Record type: Conference or Workshop Item (Paper)

Abstract

Erbium-doped fibres suffer from quenching at high Er-concentrations. We have found that cryo-cooling to liquid-nitrogen temperature (LNT) substantially improves both the threshold and slope efficiency of a heavily doped, partly quenched, erbium-doped fibre laser (EDFL). The fibre is fabricated in-house by a heated-frit method, a technique suitable for gas-phase deposition of rare-earth doped fibre. It has an Er-concentration of ~8300 ppm (wt.) in a 10 µm diameter, 0.13 NA aluminosilicate core. It was characterised in a ring laser setup with an outcoupled signal of 3 dB. In the outcoupling we include the loss of an attenuator, two tap couplers, an extra isolator, and a connector pair inserted into the cavity for experimental convenience. The 1 m doped fibre was counter-pumped in the core at 1480 nm with negligible pump leakage. Figure 1 shows the resulting laser power at LNT and RT (room temperature), calculated as the difference between the circulating power after and before amplification in the EDF. The LNT case shows clear improvements in both threshold and slope efficiency, the latter reaching 38.6%. The emission wavelength shifts from 1592 nm at RT to1572 nm at LNT.

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More information

e-pub ahead of print date: 2011
Additional Information: CJ6.3
Venue - Dates: European Conference on Lasers and Electro-Optics (CLEO-Europe/EQEC 2011), Germany, 2011-05-22 - 2011-05-26
Organisations: Optoelectronics Research Centre

Identifiers

Local EPrints ID: 341347
URI: http://eprints.soton.ac.uk/id/eprint/341347
PURE UUID: 1ab15370-b2ef-4434-89cf-43b45ef56105
ORCID for J. Nilsson: ORCID iD orcid.org/0000-0003-1691-7959

Catalogue record

Date deposited: 20 Jul 2012 10:34
Last modified: 20 Aug 2019 00:38

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Contributors

Author: R. Steinborn
Author: T.F. Yao
Author: A. Webb
Author: J.K. Sahu
Author: J. Nilsson ORCID iD

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