Synchronously pumped mode-locked Yb3+-doped fiber laser

A synchronously pumped mode-locked Yetterbium-doped Fiber Laser which has the advantages of simple design and broad applications is obtained when the pump semiconductor laser current is modulated sinusoidally at the appropriate frequency. Steady pulses were obtained on harmonic mode-locked status. At the repetition rate of 623kHz,the pulse width is about 50ns,the average output power is 2.34 mW.