Yb3＋掺杂微结构光纤研制及对飞秒激光的放大实验

Preparation of Yb3＋ Doped Microstructure Fiber and Amplification Experiment of Femtosecond Laser

采用高温等离子体非化学气相沉积技术与溶液掺杂相结合的方法制备了Yb3＋掺杂微结构光纤。该光纤在波长976nm处的损耗为7．5dB／m，表明光纤对976nm波长的抽运光具有较好的吸收效率。为测试所制备光纤的激光性能，分析了该光纤的荧光特性，并搭建了后端抽运飞秒激光放大系统。采用3m光纤，以脉宽为150fs，重复频率为50MHz，中心波长为1030nm的飞秒激光作为种子光，成功将138mw的飞秒激光放大到605mw，且模场呈高斯分布。实验结果验证了该掺杂微结构光纤制备方法的可行性，并为未来探索掺杂微结构光纤制备的新方法，探索高功率Yb3＋掺杂微结构光纤飞秒激光放大器和激光器打下了前期基础。

The Yb3＋ doped microstructure fiber is prepared by the method of high temperature plasma non-chemical vapor deposition combined with the solution doping method. Its loss is 7.5 dB/m at the wavelength of 976 nm which indicates it has good absorption efficiency at this wavelength. In order to test its laser performance, fluorescence properties are measured and a back-end pump laser amplifier system is constructed. Using an optimized ,3 m length of the fiber and the seed femtosecond laser with 150 fs pulse width, 50 MHz repetition frequency and 10,30 nm central wavelength, the femtosecond laser of 138 mW is successfully amplified to 605 roW, and the mode is in conformity with the Gaussian distribution. The results verify the feasibility of the doped fiber preparation method, make contributions to the exploration of new preparation methods of doped microstructure fiber and lay the foundations for high power Yb3＋ doped femtosecond laser amplifier and high power lasers.