Experimental and numerical investigation of mid-infrared laser in Pr^(3+)-doped chalcogenide fiber

We report on a chalcogenide glass fiber doped with Pr^(3+) that can be used for commercialized 1.5-μm and 2-μm laser excitations by emitting broadband 3 μm–5.5 μm fluorescence, which is extruded into a preform and then drawn into a step-index fiber. The spectroscopic properties of the fiber and glass are reported, and the mid-infrared fiber lasers are also numerically investigated. Cascade lasing is employed to increase the inversion population of the upper laser level. The particle swarm approach is applied to optimize the fiber laser parameters. The output power can reach 1.28 W at 4.89-μm wavelength, with a pump power of 5 W, excitation wavelength at 2.04 μm, Pr^(3+) ion concentration at 4.22 × 10^(25) ions/m^3,fiber length at 0.94 m, and fiber background loss at 3 dB/m.

Ultrabroadband mid-infrared emission from Cr^(2+):ZnSe-doped chalcogenide glasses prepared via hot uniaxial pressing and melt-quenching

We reported an ultrabroadband mid-infrared(MIR)emission in the range of 1800 nm-3100 nm at room temperature(RT)from a Cr^(2+):ZnSe-doped chalcogenide glasses(ChGs)and studied the emission-dependent properties on the doping methods.A series of Cr^(2+):ZnSe/As_(40)S_(57)Se_(3)(in unit wt.%)glass-ceramics were prepared by hot uniaxial pressing(HUP)and melt-quenching methods,respectively.The glass-ceramics with MIR emission bands greater than 1000 nm were successfully prepared by both methods.The effects of matrix glass composition and grain doping concentration on the optical properties of the samples were studied.The occurrence state,morphology of the grains,and the microscopic elemental distributions were characterized using x-ray diffraction(XRD),scanning electron microscope(SEM),and energy dispersive spectrometer(EDS)analyses.

Proteomics analysis of Huanglian Wendan decoction drug-containing serum on insulin resistance in 3T3-L1 cell

Objective:To explore possible mechanisms of Huanglian Wendan decoction drug-containing serum to improve insulin resistance.Method: 3T3-L1 fibroblasts were divided into control group, model group and TCM group. 3T3-L1 fibroblasts in model group and TCM group were induced to differentiation, and the 3T3-L1 adipocyte model of insulin resistance was constructed. The control group and model group were given normal serum stimulation, while the TCM group is treated with drug-containing serum. Finally, proceed bioinformatics analysis of the acquired differential expression protein by using TMT marking, liquid chromatography-mass (LC-MS) spectrometry, GO analysis and KEGG pathway analysis.Results:4982 proteins are identified in three groups of samples in this experiment, 4238 of them contain quantitative information. 210 up-regulate and 399 down-regulate proteins exist in model group and control group;221 up-regulate and 98 down-regulate ones are identified in TCM group and control group;310 up-regulate and 142 down-regulate proteins come to light with TCM group and control group. The result shows that the differentially expressed proteins were mainly distributed in s GO terms, such as DNA replication, nucleoplasm and protein binding of TCM group and control group. KEGG pathway enrichment analysis shows that, differentially expressed up-regulate proteins were enriched in 10 pathways, for instance DNA replication, cell cycle and mismatch repair, etc. Besides, differentially expressed down-regulate proteins were enriched in 25 pathways, enriched pathways are peroxisome, fatty acid degradation and metabolism process, etc.Conclusion: It is clear that Huanglian Wendan decoction drug-containing serum could improve insulin resistance by multi-targeting, multi-pathway synergy, and overall regulation.