Abstract

Operation of a short all-fiber passively Q-switched Raman laser pumped by a continuous-wave laser diode is experimentally demonstrated. The passively switched fiber laser consists simply of a double-clad ytterbium-doped silica fiber that is spliced directly to a moderately germanium-doped silica fiber. The placement of the Ge-doped silica fiber within the fundamental (Raman pump) cavity allows interplay between fundamental and Stokes fields to take place, which leads to saturation of the Raman gain as a result of pump depletion. Pulse widths of 70 and 60โ€‰ns at the first and second Stokes wavelengths of 1168 and 1232โ€‰nm, respectively, are produced at a stable 588โ€‰kHz repetition rate.

© 2006 Optical Society of America

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