Erbium-ytterbium co-doped fiber laser capable of inhibiting Yb-ASE

Disclosed in the utility model is an erbium-ytterbium co-doped fiber laser capable of inhibiting Yb-ASEs. The laser comprises a seed laser for generating laser as a beam of seed light, a power amplifier stage unit for carrying out power amplification on the seed light, a first all-solid photonic band gap fiber arranged at the front end of the power amplifier stage unit, and a second all-solid photonic band gap fiber arranged at the rear end of the power amplifier stage unit. Besides, the band gap of the first all-solid photonic band gap fiber has a ytterbium band wavelength without including an erbium band wavelength; and the first all-solid photonic band gap fiber is used for consuming the backward Yb-ASE. And the band gap of the second all-solid photonic band gap fiber has the ytterbium band wavelength without including the erbium band wavelength; and the second all-solid photonic band gap fiber is used for consuming the forward Yb-ASE. Compared with the prior art, the all-solid photonic band gap fibers whose band gaps cover the ytterbium bands without including the erbium bands are added to the front end and the rear end of the power amplifier stage unit and are used as mediums for inhibiting Yb-ASEs and the forward and backward Yb-ASEs under different power levels can be consumed effectively, thereby further eliminating adverse effects like self oscillation of the ytterbium band and improving the power output of the erbium-ytterbium co-doped fiber laser. And meanwhile, the stability and security of the system can also be enhanced.