Self mode-locking sub-nano second pulse laser in an all-fiber configuration

• Main Authors: Kuo-Yu Tang, 湯國煜
• Other Authors: Chien-Sheng Huang
• Format: Others
• Language: zh-TW
• Published: 2009
• Online Access: http://ndltd.ncl.edu.tw/handle/74859928355343447202

碩士 === 雲林科技大學 === 光學電子工程研究所 === 97 === The investigation majorly explored self mode-locking of self pulse. When the gain fiber was disturbed, the phenomenon of SML was observed in a yetterbium-doped ring cavity configuration. The system can produce a laser pulse width smaller than 1 ns without any modulation process such as polarization controller and dispersion compensation. In the data of the experiment, the length of cavity decided the repetition rate, pulse width was smaller than 1ns, and observing the longnitude in a stable period in mode-locked analyzer proved the phenomonen was mode-lock but not Q-switch. In the configuration, the length of the cavity and the temperature of the gain fiber was changed and observing the phenemonen of the pulse. In the last of the paper, some conferences was recommended to confirm it was a kind of the phenomonen of self mode-locking. When cavity became longer, the pulse width was broader because the dispersion of light in fiber was increased. When changing the yetterbium-doped fiber in temperature, no matter the output of the laser or pulse width, it changed obviously. When the gain fiber was in low temperature, the threshold of the current happened quickly and laser was easier to produce. When the gain fiber was in high temperayure, the threshold of the current was hardly to happen and difficlutly to produce laser. In spectrum, the gain-bandwidth added obviously when cooling the gain fiber and pulse width was broader.