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Proceedings Paper

Brightness enhancement limits in pulsed cladding-pumped fiber Raman amplifiers
Author(s): Junhua Ji; Christophe A. Codemard; Johan Nilsson
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Paper Abstract

We analyze theoretically limitations on brightness enhancement of a multimode pump beam into a diffraction-limited Stokes beam in efficient cladding-pumped fiber Raman amplifiers. Firstly, the power-scaling of the 1st Stokes (hence the brightness enhancement) is limited by the generation of the 2nd order Stokes. Thus using a spectral waveguide filter such as a W-type fiber core, it is possible to improve this limit to nearly five times that of a normal fiber without spectral filter. Secondly, we analyze limits set by glass damage, propagation loss, and pump-signal pulse walk-off in the multimode fiber. We show that a well-designed fiber with a propagation loss of 3.5 dB/km allows for a pump-to-signal brightness improvement of over 1000 times for pulses longer than 40 ns and up to 3500 times in the cw regime.

Paper Details

Date Published: 17 February 2010
PDF: 8 pages
Proc. SPIE 7580, Fiber Lasers VII: Technology, Systems, and Applications, 75801L (17 February 2010); doi: 10.1117/12.844919
Show Author Affiliations
Junhua Ji, Univ. of Southampton (United Kingdom)
Christophe A. Codemard, Univ. of Southampton (United Kingdom)
Johan Nilsson, Univ. of Southampton (United Kingdom)

Published in SPIE Proceedings Vol. 7580:
Fiber Lasers VII: Technology, Systems, and Applications
Kanishka Tankala, Editor(s)

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