掺镱光纤光暗化研究进展——溶胶凝胶法抑制光暗化 Research Progress on Photodarkening of Yb-Doped Fiber—Sol-Gel Method to Suppress Photodarkening

高功率掺镱光纤激光器的光暗化现象导致激光器功率降低，阻碍了激光器功率的进一步提升，因此研究掺镱光纤光暗化现象对促进掺镱光纤激光器的发展具有重要意义。本文首先从光暗化的表征、光暗化对激光器的影响及其机理，光暗化的影响因素及抑制手段方面对光暗化进行了综述，阐述了光暗化的研究进展；然后简单介绍了采用溶胶凝胶法工艺制备掺镱光纤的研究进展，并提出了采用溶胶凝胶法制备的掺镱光纤可能具有抑制光暗化效果的猜想。 Photodarkening of high power Yb-doped fiber lasers leads to the decrease of laser power, which limits the further development of high power laser. Therefore, it is significantly important to study the photodarkening behavior of Yb-doped fiber lasers. Firstly, the research progress of photodarkening in Yb-doped fiber is reviewed in this paper, including characterization, impact factors, mechanism, and suppression. Then based on the research progress of Sol-Gel method, it is proposed that the Yb-doped fiber prepared by Sol-Gel method may inhibit photodarkening.