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Efficient low-brightness-pumped Raman amplification of a single high-order Bessel-mode in 335-m of 70-μm-diameter silica-core step-index fiber

Efficient low-brightness-pumped Raman amplification of a single high-order Bessel-mode in 335-m of 70-μm-diameter silica-core step-index fiber
Efficient low-brightness-pumped Raman amplification of a single high-order Bessel-mode in 335-m of 70-μm-diameter silica-core step-index fiber
We experimentally demonstrate Raman amplification of signal pulses in a high-order Bessel mode (LP06) at a wavelength of 1121 nm in a 335-m step-index fiber with a 70-μm diameter, 0.227-NA pure-silica core. This was pumped by 5-ns multimode pulses at 1065 nm from an Yb-doped fiber MOPA. The mode purity of the amplified pulses is well preserved to 23 dB of average-power gain, to 774 W of peak power in 2 ns pulses at 20 kHz repetition rate, when pumped with a peak power of 942 W. The pump depletion as averaged over the signal pulses reaches 59%. We believe that this is the first demonstration of stable mode propagation and Raman amplification of a single Bessel-like higher order mode in a fiber of hundreds of meters. This shows the potential for efficient power scaling of a single signal mode with low-brightness pumping, comparable with that from continuous-wave multimode diode lasers.
0146-9592
6018-6021
Zhu, Sheng
0c71d889-2dbe-4bcc-add0-02e00d93cc77
Feng, Yutong
8257a816-5e4a-47bc-8aa2-e364c4d6e21e
Barua, Pranabesh
ab53bdd9-e00f-46b0-b4f4-5ab6534fe8a6
Nilsson, Johan
f41d0948-4ca9-4b93-b44d-680ca0bf157b
Zhu, Sheng
0c71d889-2dbe-4bcc-add0-02e00d93cc77
Feng, Yutong
8257a816-5e4a-47bc-8aa2-e364c4d6e21e
Barua, Pranabesh
ab53bdd9-e00f-46b0-b4f4-5ab6534fe8a6
Nilsson, Johan
f41d0948-4ca9-4b93-b44d-680ca0bf157b

Zhu, Sheng, Feng, Yutong, Barua, Pranabesh and Nilsson, Johan (2020) Efficient low-brightness-pumped Raman amplification of a single high-order Bessel-mode in 335-m of 70-μm-diameter silica-core step-index fiber. Optics Letters, 45 (21), 6018-6021. (doi:10.1364/OL.404602).

Record type: Article

Abstract

We experimentally demonstrate Raman amplification of signal pulses in a high-order Bessel mode (LP06) at a wavelength of 1121 nm in a 335-m step-index fiber with a 70-μm diameter, 0.227-NA pure-silica core. This was pumped by 5-ns multimode pulses at 1065 nm from an Yb-doped fiber MOPA. The mode purity of the amplified pulses is well preserved to 23 dB of average-power gain, to 774 W of peak power in 2 ns pulses at 20 kHz repetition rate, when pumped with a peak power of 942 W. The pump depletion as averaged over the signal pulses reaches 59%. We believe that this is the first demonstration of stable mode propagation and Raman amplification of a single Bessel-like higher order mode in a fiber of hundreds of meters. This shows the potential for efficient power scaling of a single signal mode with low-brightness pumping, comparable with that from continuous-wave multimode diode lasers.

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404602_3 - Accepted Manuscript
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In preparation date: 2020
Accepted/In Press date: 24 September 2020
e-pub ahead of print date: 27 October 2020
Published date: 1 November 2020

Identifiers

Local EPrints ID: 446210
URI: http://eprints.soton.ac.uk/id/eprint/446210
ISSN: 0146-9592
PURE UUID: f9ba59ea-7f0e-409f-be93-a2f81496716d
ORCID for Sheng Zhu: ORCID iD orcid.org/0000-0002-4256-6307
ORCID for Yutong Feng: ORCID iD orcid.org/0000-0002-6839-2106
ORCID for Johan Nilsson: ORCID iD orcid.org/0000-0003-1691-7959

Catalogue record

Date deposited: 28 Jan 2021 17:32
Last modified: 10 Jan 2022 06:08

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Contributors

Author: Sheng Zhu ORCID iD
Author: Yutong Feng ORCID iD
Author: Pranabesh Barua
Author: Johan Nilsson ORCID iD

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