Abstract

Single frequency ytterbium fiber laser was demonstrated by introducing loop mirror filter and fiber polarization controller in linear cavity. The loop mirror with unpumped ytterbium fiber discriminated and selected laser longitudinal modes efficiently. Spatial hole burning effect was restrained by adjusting the polarization state of the intracaivty waves. 14.1mW, 1064nm single frequency laser was generated, the slope efficiency was 21%. The wavelength can be tuned about 1nm by temperature tuning the output coupler FBG. When adopting dual closely cascaded FBGs as the output coupler, the operation range of single frequency laser was expanded, output power was up to 18 mW.

© 2005 Optical Society of America