A novel single-mode, linearly polarized, erbium-doped fiber laser with a stabilized frequency

We report on an experimental study of a stabilized single-mode, linearly polarized, erbium-doped fiber laser with an unique structure of double-cavities. In its linear cavity, the effect of spatial-hole burning (SHB) is eliminated to prevent multi-longitudinal-mode oscillation by using 45° Faraday rotator mirror, meanwhile, in its another polarization maintaining ring cavity, the effect of SHB induced by a stable external light and the lasing light is enhanced efficiently to suppress the mode-hopping by the polarization state control method. Consequently, a single-mode, linearly polarized operation is demonstrated with the lasing frequency shift of less than 20MHz, its linewidth less than 3.5 kHz and the degree of polarization of 99. 9%.