Study of laser dynamics and nonlinear effect in pulsed fiber lasers

• Main Authors: Jian-An Chen, 陳建安
• Other Authors: Yin-Wen Lee
• Format: Others
• Language: zh-TW
• Published: 2017
• Online Access: http://ndltd.ncl.edu.tw/handle/4ab324

碩士 === 國立臺北科技大學 === 光電工程系研究所 === 105 === Along the development of optical fiber laser, pulsed laser system is one way to enhance the laser peak power. A high peak power laser with narrow pulses is required in micro-machinery and medical applications. Therefore, how to compress the laser pulse is an important research direction in the field of pulsed fiber laser. In general, the gain fiber determines the laser output wavelength. At present, the active ions used in the fiber laser are ytterbium, erbium, thulium and Holmium. Although these ions have large emission bandwidths, available fiber laser sources tend to exhibit relatively narrow linewidths. On the other hand, supercontinuum laser source can further extend the laser application scope, which is mostly limited by the laser narrow linewidth. Mode-locked fiber lasers with kW-level peak powers as well as the ultrashort pulse widths are good sources for supercontinuum generation. The high peak power can broaden the bandwidth of mode-locked lasers source through Stimulated Raman scattering, Self-phase modulator, and other nonlinear effects. In this work, we optimize the operating parameters of the acousto-optic modulator to compress the output pulses of the Q-switched Yb3+ doped fiber laser. In addition, we have investigated the spectrum modulation property of a homemade fiber taper in a commercial Tm3+ doped mode-locked fiber laser.