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, San Francisco, 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.
More information
e-pub ahead of print date: 2010
Additional Information:
7580-56
Venue - Dates:
SPIE: Fiber Lasers VII: Technology, Systems, and Applications, San Francisco, 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
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Date deposited: 22 Jun 2012 12:31
Last modified: 15 Mar 2024 02:59
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Contributors
Author:
Junhua Ji
Author:
Christophe A. Codemard
Author:
Johan Nilsson
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