Abstract
In this thesis, we designed, constructed and characterized a high-power master oscillator power amplifier system using a dual-stage ytterbium doped fiber amplifier. A diode-pumped solid-state passively mode-locked Nd:GdVO4 laser is the seed laser. For the preamplifier stage, the 10 μm core Yb-doped fiber amplifier is used. For the main amplifier stage, the 30 μm core Yb-doped fiber amplifier is used. After amplification, we can achieve over 60 W output power of 1064 nm signal with pulse width of ~ 10 picosecond (repetition rate ~ 250 MHz). The amplified pulses exhibit excellent beam quality (M2 ~ 1.6). The experimental results are in good agreement with theoretical and predictions.