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Brightness enhancement limits in pulsed cladding pumped fiber Raman amplifiers

Brightness enhancement limits in pulsed cladding pumped fiber Raman amplifiers
Brightness enhancement limits in pulsed cladding pumped fiber Raman amplifiers
We analyze theoretically limitations on the brightness enhancement of a multimode pump beam, to be efficiently converted into a diffraction-limited Stokes beam in a cladding-pumped fiber Raman amplifier. For a given minimum Raman pump absorption, parasitic 2nd Stokes generation limits the cladding-to-core area ratio, and thus the brightness enhancement. A W-type fiber acting as a spectral waveguide filter allows for nearly five times larger inner-cladding areas by suppressing the 2nd Stokes. We further analyze limits set by glass damage and indirectly propagation loss, as well as pulse walk-off. A well-designed fiber with 3.5 dB/km propagation loss allows for a pump-to-signal brightness improvement of up to 3600 times both in the pulsed and the cw regime.
Ji, Junhua
b8f18985-425b-4077-9242-9e624e80299c
Codemard, Christophe A.
3aa50483-b61c-4e7e-b178-c9a88bb47bef
Nilsson, Johan
f41d0948-4ca9-4b93-b44d-680ca0bf157b
Ji, Junhua
b8f18985-425b-4077-9242-9e624e80299c
Codemard, Christophe A.
3aa50483-b61c-4e7e-b178-c9a88bb47bef
Nilsson, Johan
f41d0948-4ca9-4b93-b44d-680ca0bf157b

Ji, Junhua, Codemard, Christophe A. and Nilsson, Johan (2010) Brightness enhancement limits in pulsed cladding pumped fiber Raman amplifiers. SPIE: Fiber Lasers VII: Technology, Systems, and Applications, United States. 23 - 28 Jan 2010. (doi:10.1117/12.844919).

Record type: Conference or Workshop Item (Paper)

Abstract

We analyze theoretically limitations on the brightness enhancement of a multimode pump beam, to be efficiently converted into a diffraction-limited Stokes beam in a cladding-pumped fiber Raman amplifier. For a given minimum Raman pump absorption, parasitic 2nd Stokes generation limits the cladding-to-core area ratio, and thus the brightness enhancement. A W-type fiber acting as a spectral waveguide filter allows for nearly five times larger inner-cladding areas by suppressing the 2nd Stokes. We further analyze limits set by glass damage and indirectly propagation loss, as well as pulse walk-off. A well-designed fiber with 3.5 dB/km propagation loss allows for a pump-to-signal brightness improvement of up to 3600 times both in the pulsed and the cw regime.

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More information

e-pub ahead of print date: 2010
Additional Information: 7580-56
Venue - Dates: SPIE: Fiber Lasers VII: Technology, Systems, and Applications, United States, 2010-01-23 - 2010-01-28
Organisations: Optoelectronics Research Centre

Identifiers

Local EPrints ID: 340471
URI: http://eprints.soton.ac.uk/id/eprint/340471
PURE UUID: a76c538e-cd6f-42a7-9faa-0e94224d3314
ORCID for Johan Nilsson: ORCID iD orcid.org/0000-0003-1691-7959

Catalogue record

Date deposited: 22 Jun 2012 12:31
Last modified: 12 Nov 2019 01:55

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