掺铒光纤环形激光器输出波长的研究

为了得到掺铒光纤环形激光器的激光运行波长与掺铒光纤长度和耦合比之间对应关系,基于3能级的速率方程采用解析方法进行了理论分析,并通过实验给予验证,分别取得了激光运行波长随掺铒光纤长度和耦合器耦合比变化的数据。结果表明,随着光纤长度的增加,激光的输出波长往长波方向移动,输出波长为1563nm 时输出功率最大,掺铒光纤最佳长度大约为11.5m,耦合比越大,激光的输出波长越短。这一结果对改变耦合比进行光纤激光器激光波长调谐的设计有很大帮助。

Analysis of lasing wavelengths for erbium-doped fiber ring lasers

In order to analyze the relationship among the lasing wavelength,length and coupler ratio of erbium-doped fibers,the rate equation based on 3rd energy state was solved and confirmed in experiments.The lasing wavelengths changing with the length and coupler ratio of erbium-doped fibers were obtained.The result shows that the lasing wavelength is shifted to longer wavelength with the decrease of the length of the erbium-doped fiber.The maximum output power occurs at 1563nm when the optimum length of the erbium-doped fiber is 11.5m.In addition,the lasing wavelength becomes shorter wavelength with the decrease of the coupler ratio.These are good for the optimized design of a tunable erbium-doped fiber laser by varying coupler ratio.