The Research of High Peak Power Femtosecond Ytterbium-doped Fiber Laser Amplifier

• Main Authors: Lin, Hsu-Chen, 林頊宸
• Other Authors: Lin, Chun-Ting
• Format: Others
• Language: zh-TW
• Published: 2013
• Online Access: http://ndltd.ncl.edu.tw/handle/66567467684909028156

碩士 === 國立交通大學 === 光電系統研究所 === 102 === In this thesis, we introduce how to construct high peak power laser amplifier systems. The seed source is a passively mode-locked fiber laser using semiconductor saturable absorber mirrors (SESAM). The average power is 27mW at a repetition rate of 30MHz.The pulse width is 6ps. In order to avoid fiber nonlinear effect, we adopt chirp pulse amplification system. Three major components are included: Fiber strectcher, Fiber amplifier systems and Compressor, respectively. The pulse width of light source can be broadened by the fiber stretcher, reducing the peak power accompanied with nonlinear effect. As for fiber amplifier systems, we reduce the repetition rate of pulse laser by adding acoustic optical modulator (AOM) in an effort to use lower average power to achieve the same pulse energy. In the end, we finish three-stage Yb-doped fiber laser amplifier. The average power is 3W at a repetition rate of 1MHz.The pulse width is 96.98ps. These pulses can be further recompressed down to 679 fs after passing through a diffraction grating compressor when the incident angle is 27 degree and gratings separation is 65cm. The result makes a peak power over 1MW.