Abstract

Single-frequency laser operation near 2μm has been demonstrated in an all-fiber short-cavity (26cm) distributed feedback laser cavity using both cladding- and core-pump configurations in a newly developed heavily Tm-doped multicomponent silicate glass fiber. Using a single-mode Er-doped fiber laser at 1575nm as a core-pump source, a 2-cm-long distributed Bragg reflector fiber laser delivers single-frequency output at 1950nm with laser linewidth less than 3kHz, which is, to the best of our knowledge, the narrowest linewidth demonstrated to date from any 2μm single-frequency laser.

© 2009 Optical Society of America

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