Luminescence of Co-doped SrTiO_3:Pr^(3+)

The SrTiO3 ： Pr^3＋ material, co-doped with monovalent Li^＋ , divalent Mg^2＋ , and trivalent Al^3＋ was prepared by a new sol-gel method. The phase and crystallinity of the synthesized materials were investigated by powder X-ray diffraction（XRD） and scanning electron microcopy（SEM）. Among the co-doped ion, Al^3＋ incorporation caused the least lattice change and had the best crystallinity. Photoluminescence spectra were taken to investigate the luminescence characteristics. We observed a red luminescence change of SrTiO3 ： Pr^3＋ after being co-doped, and a best enhancement on the red luminescence with the trivalent Al^3＋ was observed. The present results indicated that the charge defect associated with Al^3＋ has led to charge compensation of Pr^＋ and also implied that the charge defects（usually the second dopant ions replacing the A or B sites in the lattice） which are closer to PrSr^＋ contribute more to the red luminescence enhancement.

Ho^(3+)/Pr^(3+)共掺氟化铝基玻璃光纤2.86μm激光性能研究(特邀)

文中使用熔融淬火法制备了氟化铝基、氟化铟基和氟化锆基玻璃样品,通过浸水实验研究了其抗潮解稳定性,结果表明氟化铝基玻璃具有更好的抗潮解性能。因此制备了不同浓度的Ho^(3+)/Pr^(3+)共掺氟化铝基玻璃样品,测试了其透过光谱,表明该玻璃具有高的透过率和宽的透过窗口。在1150 nm拉曼激光的激发下,获得了样品的发射光谱,并对其发光机理进行了分析。利用吸注法制备了2 Ho^(3+)/0.2 Pr^(3+)掺杂的氟化铝基玻璃预制棒,使用棒管法拉制了氟化铝基玻璃光纤。使用回切法测得光纤在793 nm处的损耗为1.8 dB/m。在1150 nm激光泵浦下,利用8.6 cm长的Ho^(3+)/Pr^(3+)共掺氟化铝基玻璃光纤作为增益介质,获得了功率为207 mW的2.865μm激光输出,斜率效率为11.4%。上述研究结果表明,氟化铝基玻璃光纤是一种稳定的中红外激光增益材料。

基于氟化铝基玻璃光纤的瓦级~3μm激光

研究了基于Ho^(3+)/Pr^(3+)共掺AlF_(3)基玻璃单包层光纤的瓦级~3μm激光。采用单模1150 nm光纤激光器泵浦上述增益光纤,得到了波长2.87μm的激光输出,其最大输出功率为1.02 W,激光斜率效率为10.7%,输出激光的光束质量因子M2≈1.2。研究结果表明,AlF_(3)基玻璃光纤是一种潜在的可获得高功率中红外激光输出的增益介质。

Effect of chloride on spectrum properties of Pr^3+/Ho^3+ co-doped fluorozirconate glasses

An effective method of improving the luminescent properties of rare earth ions in fluoride glasses were reported.The Pr^3+/Ho^3+co-doped fluorochlorozirconate luminescent glasses were prepared,and the effects of chloride on the spectral properties and structure of the glasses were studied.According to the results,the glass stability is improved,and the luminescence intensity in the visible range is significantly enhanced with the introduction of chloride.By introducing 7.5 mol% BaCl2,the luminescence intensity reaches the maximum and increases by three times,The mechanism of luminescence enhancement is explained by analyzing the correlation between the composition and the structure.The chloride ions disperse outside the glass network before the introduction of 7.5 mol% BaCl2 and increased dispersity of Pr^3+and Ho^3+ions in the fluorozirconate glasses.