| Summary: | 碩士 === 國立臺北科技大學 === 光電工程系研究所 === 105 === In this thesis, we introduce how to construct high power laser amplifier systems. The seed source is a passively mode-locked fiber laser using semiconductor saturable absorber mirrors (SESAM). The average power is 7mW at a repetition rate of 30MHz.The pulse width is 6ps. In order to avoid fiber nonlinear effect, we adopt chirp pulse amplification system. In this architecture, including fiber stretcher、fiber amplifier systems、compressor. The fiber stretcher can broaden the pulse width of light source to reduce the peak power accompany with nonlinear effect. In fiber amplifier systems, we want to use lower average power to achieve the same pulse energy. So, we reduce the repetition rate of pulse laser by adding acoustic optical modulator (AOM).
Finally, we accomplish three stage Yb-doped fiber laser amplifiers. The average power is 3W at a repetition rate of 967Hz.The pulse width is 100.01ps. These pulses can be recompressed down to500 fs after passing through a diffraction grating compressor, consisting of a pair of 1600 l/mm gratings separated by 5cm , resulting in a pulse energy over 1μJ.
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