Investigation on a novel Fabry-Perot filter for high power tunable fiber laser

A novel tunable Fabry-Perot (F-P) filter was developed to meet the requirement of high power tunable fiber lasers. It consisted of two fiber collimators, a cavity length tunable F-P cavity and a piezoelectric transducer (PZT). By changing the voltage applied to PZT, the length of F-P cavity could be tuned finely. A wide tunable wavelength range of 50 nm was achieved with a fineness of 134. The developed F-P tunable filter was used to construct a ring-shaped tunable Yb fiber laser, using Yb3+-doped fiber as the gain media. A tunable range of 32.5 nm was realized for the laser output, covering the wavelength between 1032.82 and 1065.32 nm. The maximum output power of laser was 2.72 mW with a linewidth of 0.078 nm.