In this work, deuterium loaded Yb-doped fiber has been proposed to mitigate mode instability in laser oscillator. Experimental results reveal that mode instability threshold power rises from ~459W to ~533W and ~622W at the condition of pristine fiber and fiber loaded with deuterium for 2 weeks and 4 weeks respectively. Mode instability threshold power is raised by more than 16% and 35% after 2 and 4 weeks deuterium loading compared to pristine fiber respectively, and laser slope efficiency is not affected by deuterium loading. The experimental results indicate that deuterium loading is effective in mode instability mitigation and showing potentials in further power scaling of high power fiber lasers.
This work demonstrates the synthesis of indium tin oxide nanocrystals (ITO NCs) in mesoporous silica glasses (MSG) via the impregnation and decomposition method. The original MSG have many uniformly distributed mesopores (5-40 nm) which can regulate and control the size and distribution of ITO NCs. Factors that affect the properties of ITO NCs including temperature and holding time have been mainly studied. Interestingly, the enhanced down-conversion fluorescence intensity of Er3+/Yb3+ ions due to the energy transfer from ITO NCs has also been observed. Our work can widen the applications of semiconductor oxides in optoelectronics with a facile way.