Compact Narrow Linewidth Actively Q-Switched Er-Yb Double-Clad Fiber Laser

Actively Q-switched laser operation of a narrow linewidth compact fiber laser based on an Er-Yb double-clad fiber is presented. The laser linewidth as a function of the repetition rate and the Q-switched pulses characteristics for different pump powers are experimentally analyzed. Stable Q-switched laser operation with spectral laser linewidth of 73 pm in a repetition rate range from 90 to 270 kHz is obtained. The minimum pulse duration of 178 ns, maximum peak power of 30.5 W, and maximum pulse energy of 5.4 mu J are observed. The maximum average power reached is 1.1 W.