Single-frequency and polarization-stable oscillation of Fabry-Perot fiber laser using a nonpolarization-maintaining fiber and an intracavity etalon

We propose a novel configuration of Fabry-Perot fiber lasers for achieving single-frequency and polarization-stable oscillation. The laser consists of a nonpolarization-maintaining active fiber, Faraday rotator mirrors, and a specially designed intracavity frequency-selective element. An erbium-doped fiber laser is actually constructed according to the cavity design, and we can observe stable single longitudinal-mode oscillation.