We report the design and simulation results of a solid-core Bragg fiber with 3-bilayer periodic cladding. The simulation results present single mode bandgap guidance, a large effective area of -400 μm2 around 1.08 μ...We report the design and simulation results of a solid-core Bragg fiber with 3-bilayer periodic cladding. The simulation results present single mode bandgap guidance, a large effective area of -400 μm2 around 1.08 μm, a very low bend loss of 0.038dB/m at 1.08μm even under tight bend radius （R = 4cm）, and excellent beam quality. The results indicate that the proposed fiber could be a competitive solution for high-power fiber laser applications.展开更多
基金Supported by the National Natural Science Foundation of China under Grant No 61405240
文摘We report the design and simulation results of a solid-core Bragg fiber with 3-bilayer periodic cladding. The simulation results present single mode bandgap guidance, a large effective area of -400 μm2 around 1.08 μm, a very low bend loss of 0.038dB/m at 1.08μm even under tight bend radius （R = 4cm）, and excellent beam quality. The results indicate that the proposed fiber could be a competitive solution for high-power fiber laser applications.
文摘该研究通过顶空固相微萃取-气相色谱-质谱联用技术(headspace-solid phase microextraction-gas chromatography-mass spectrometry,HS-SPME-GC-MS)和高通量测序技术系统解析了3种大曲的特征香气化合物及微生物群落结构。研究发现,3种大曲分为以吡嗪类或以酯类化合物为主体风味两类。采用多元统计分析并根据变量投影重要性指标(variable importance in the projection,VIP)分析共鉴定出31种特征香气化合物。利用高通量测序技术对大曲的细菌群落结构进行解析,结合相关性分析,从多个维度判定了其核心微生物为火山渣芽孢杆菌属(Scopulibacillus)和芽孢杆菌属(Bacillus),其与多种吡嗪类、酚类、醇类等特征风味物质显著相关。通过分离培养及固态发酵实验探究其风味代谢能力,核心微生物的应用结果表明大曲细菌菌群的生物量及吡嗪类化合物的含量明显提升,改变了大曲的香气组成,进一步证实了其对大曲主体风味的调控功能。该研究在实现大曲风味定向调控、提升白酒品质方面具有重要意义。
