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Analysis of the conversion to the first Stokes in cladding-pumped fiber Raman amplifiers

Analysis of the conversion to the first Stokes in cladding-pumped fiber Raman amplifiers
Analysis of the conversion to the first Stokes in cladding-pumped fiber Raman amplifiers
In this paper, we analyze the optical conversion efficiency of a multimode pump source into a diffraction-limited beam in cladding-pumped Raman fiber lasers and amplifiers. We theoretically derive a relation of the cladding/core area ratio for efficient energy transfer from the pump into the first Stokes while avoiding the second Stokes generation that impedes the conversion efficiency of the first Stokes. In addition, we investigate experimentally the limits on the conversion efficiency in a pulse-pumped double-clad Raman fiber. We obtained a peak power conversion efficiency into the first Stokes in excess of 75% and a pulse energy conversion of 60%.We found that spatial pump mode depletion is the main limiting factor in this fiber, with concentric cladding and core. We discuss various solutions to overcome these limitations and improve on the current results.
0018-9197
129-139
Ji, Junhua
b8f18985-425b-4077-9242-9e624e80299c
Codemard, Christophe A.
3aa50483-b61c-4e7e-b178-c9a88bb47bef
Ibsen, Morten
22e58138-5ce9-4bed-87e1-735c91f8f3b9
Sahu, Jayanta K.
009f5fb3-6555-411a-9a0c-9a1b5a29ceb2
Nilsson, Johan
f41d0948-4ca9-4b93-b44d-680ca0bf157b
Ji, Junhua
b8f18985-425b-4077-9242-9e624e80299c
Codemard, Christophe A.
3aa50483-b61c-4e7e-b178-c9a88bb47bef
Ibsen, Morten
22e58138-5ce9-4bed-87e1-735c91f8f3b9
Sahu, Jayanta K.
009f5fb3-6555-411a-9a0c-9a1b5a29ceb2
Nilsson, Johan
f41d0948-4ca9-4b93-b44d-680ca0bf157b

Ji, Junhua, Codemard, Christophe A., Ibsen, Morten, Sahu, Jayanta K. and Nilsson, Johan (2009) Analysis of the conversion to the first Stokes in cladding-pumped fiber Raman amplifiers. IEEE Journal of Quantum Electronics, 15 (1), 129-139. (doi:10.1109/JSTQE.2008.2010229).

Record type: Article

Abstract

In this paper, we analyze the optical conversion efficiency of a multimode pump source into a diffraction-limited beam in cladding-pumped Raman fiber lasers and amplifiers. We theoretically derive a relation of the cladding/core area ratio for efficient energy transfer from the pump into the first Stokes while avoiding the second Stokes generation that impedes the conversion efficiency of the first Stokes. In addition, we investigate experimentally the limits on the conversion efficiency in a pulse-pumped double-clad Raman fiber. We obtained a peak power conversion efficiency into the first Stokes in excess of 75% and a pulse energy conversion of 60%.We found that spatial pump mode depletion is the main limiting factor in this fiber, with concentric cladding and core. We discuss various solutions to overcome these limitations and improve on the current results.

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Published date: January 2009
Organisations: Optoelectronics Research Centre

Identifiers

Local EPrints ID: 78852
URI: https://eprints.soton.ac.uk/id/eprint/78852
ISSN: 0018-9197
PURE UUID: 56815dfc-9733-45dd-982d-ce1d4fff4bb5
ORCID for Johan Nilsson: ORCID iD orcid.org/0000-0003-1691-7959

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Date deposited: 15 Mar 2010
Last modified: 05 Dec 2019 01:38

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Contributors

Author: Junhua Ji
Author: Morten Ibsen
Author: Jayanta K. Sahu
Author: Johan Nilsson ORCID iD

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