High Peak-Power Active Q-Switched Fiber Laser

• Main Authors: Yi-Hao Huang, 黃益豪
• Other Authors: 王子建
• Format: Others
• Language: zh-TW
• Published: 2007
• Online Access: http://ndltd.ncl.edu.tw/handle/dr87g8

碩士 === 國立臺北科技大學 === 光電工程系研究所 === 95 === In this work, an active Q-switched erbium-ytterbium co-doped double cladding fiber laser is studied. In the experiment, the linear cavity structure is used and the acousto-optic modulator is utilized as a Q-switch. The high-peak power Q-switched fiber laser adopts the linear cavity formed by the reflection mirror with high reflectivity at 1550nm and the perpendicular fiber end. In the pulse compression process, the acousto-optic modulator is used as the Q-switch to produce the pulse with short duration. This studies uses three kind of erbium-ytterbium co-doped double cladding fiber as gain medium. The effects of pump power, pulse repetition rate, and erbium-doped fiber length on the pulse properties, including pulse peak power and pulse duration, are discussed. Experimental results show that high pump power and low repetition rate facilitate the enhancement of pulse peak power and reduction of pulse duration. Under the condition of optimal pulse peak power, the pulse with peak power of 22.69kW and pulse duration of 13ns is produced in the active Q-switched fiber laser using erbium-ytterbium co-doped large-mode-area double cladding fiber length of 9m with repetition rate of 0.1kHz and pump power of 7W.