Abstract

Influence of fiber length on the self-pulsing (SP) characteristics of 2μm Tm3+-doped silica fiber lasers are investigated experimentally and theoretically. In SP operation, the laser pulse width narrows and the repetition rate increases with the decrease of fiber length. By shortening the fiber length to 2m and angle-polishing the output fiber-end facet, SP pulse width less than 100ns is achieved, comparable to that from conventional actively Q-switched Tm3+ fiber lasers. Theoretically simulated SP characteristics of the 2μm Tm3+-doped fiber laser show good agreement with the experimental results. Further narrowing the pulse width in SP fiber lasers and their potential applications are also discussed.

© 2011 Optical Society of America

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