Brightness enhancement limits in pulsed cladding-pumped fiber Raman amplifiers

Junhua Ji; Christophe A. Codemard; Johan Nilsson

doi:10.1117/12.844919

17 February 2010 Brightness enhancement limits in pulsed cladding-pumped fiber Raman amplifiers

Junhua Ji, Christophe A. Codemard, Johan Nilsson

Proceedings Volume 7580, Fiber Lasers VII: Technology, Systems, and Applications; 75801L (2010) https://doi.org/10.1117/12.844919
Event: SPIE LASE, 2010, San Francisco, California, United States

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 1^st Stokes (hence the brightness enhancement) is limited by the generation of the 2^nd 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.

Citation Download Citation

Junhua Ji, Christophe A. Codemard, and Johan Nilsson "Brightness enhancement limits in pulsed cladding-pumped fiber Raman amplifiers", Proc. SPIE 7580, Fiber Lasers VII: Technology, Systems, and Applications, 75801L (17 February 2010); https://doi.org/10.1117/12.844919

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