Nd3 strengthens the Er3 :2.7-\mu m emission 104 times in fluorophosphate glass; in addition, it can also decrease its upconversion effects and the 1.5-\mu m emission accordingly. Cross-relaxation process is the principal transition mechanism in this co
We develop a low frequency fiber Fabry–Perot (F-P) seismometer based on transfer function analysis. The seismometer structure and demodulation system accuracy are limitations of low frequency seismic monitoring. The transfer function of the F-P seismomete
The transmittance characteristics of ZnS ceramics with infrared (IR) (3 - 5 and 8 - 12 μm) antireflective coatings are studied. The film designs are optimized with programmed software. A double-side and double-layer scheme is employed. Two different doubl
The use of Pr3 co-doping for great enhancement of mid-infrared (mid-IR) emissions at 2.9 μm and 2.4 μm is investigated in the Ho3 /Pr3 co-doped LiYF4crystals. With the introduction of Pr3 ions, the fl