Comment on "passively Q-switched fiber laser that uses saturable Raman gain".
Recently, an interesting pulsing behavior of a fiber laser with intracavity Raman conversion was reported [Y. Zhao and S. D. Jackson, Opt. Lett.31, 751 (2006)]. The pulsing has been interpreted as passive Q switching, but this interpretation needs to be revised. An alternative explanation predicts transient phenomena, which do not lead to a regular pulse train.
Paschotta
Rüdiger
R
RP Photonics Consulting GmbH, Zurich, Switzerland. paschotta@rp-photonics.com