共查询到14条相似文献,搜索用时 62 毫秒
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卤化银多晶光纤传输CO2激光性能的研究 总被引:3,自引:0,他引:3
通过采用高真空熔炼、反应气氛下区域融熔和高真空石英安瓿内单晶生长等特殊工艺方法对卤化银原料进行提纯,并用热挤压成型方法制得卤化银光纤.本文研究了卤化银原料的提纯和光纤成型工艺对损耗的影响,研究结果表明,增加提纯次数可降低卤化银光纤预制棒的吸收系数.通过合理控制工艺参数,提纯后的卤化银原料制成的光纤预制棒,经CO2激光量热计法测量在10.6μm处的吸收系数<5×10-4cm-1,热挤压成型的光纤在10.6μm处的损耗为0.3~0.5dB/m,直径φ10mm、长度1.64m的光纤可传输CO2激光功率>20W. 相似文献
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采用反应氯气气氛下水平区域熔融生长单晶的方法对卤化银原料进行超提纯,反应氯气气氛是由裂解低沸点碳氯化合物得到;化合物的通式为CHnCl4-n(n=0,1,2).提纯的温度为450~500℃,温区移动速度为0.2~0.8mm/min;载流气体Ar的流量为80~160mL/min.提纯后的卤化银原料红外吸收光谱显示,在4000~800cm-1(2.5~12.5μm)区域内的吸收随波长的增加而降低,中红外4000~600cm-1(2.5~16μm)区域是卤化银材料最佳的传输波段.用此原料制成的光纤可传输3.3~16μm中红外光谱;传输10.6μmCO2激光的损耗为0.3~0.5dB/m. 相似文献
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大功率CO2激光熔凝稳定ZrO2 总被引:4,自引:0,他引:4
利用大功率CO2激光熔凝稳定ZrO2高温快离子导体获得成功.报导了激光熔凝的原理、工艺过程及熔凝后样品的微观分析等研究结果.激光熔凝的CSZ和MSZ快离子导体样品在温度为1000℃时的电导率达到2×10-2Ω-1cm-1量级. 相似文献
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Portugal is one of the major European producers of natural stones. In the last decade, transformation of stones has been privileged in most of the companies and the quantity of finished product for exportation increased with a major added value. New technologies and processes have been investigated. For example, CO2 laser has been used for cutting, marking, and drilling. The major advantage of this tool is its flexibility, and thus, it improved the working environment significantly. This article presents a report on the use of CO2 lasers in the cutting process of marbles and limestones. The cut quality was evaluated by adjusting the laser output power and assist gas type and pressure. The CO2 laser can be used as a feasible tool for cutting ornamental stones. Due to the economic reasons, it is specially adequate for cutting nonlinear shapes where conventional cutting tools, such as the diamond wires and saws, have limitations on both the shape and the dimensions to be cut. 相似文献
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在双模干涉型光纤传感器中,为了消涂光纤引导段的敏感效应,需要选择性地激发光纤的基模,本文对半导体激光器(简称LD)与光纤基模的耦合进行了理论上的分析。在高斯分布漠场假设的基础上,给出了激光束腰半径和光纤基模模场半径的表达式,以及利用透镜进行两模式匹配的具体光学计算公式。据此进行的LD与高双折射光纤偏振模(基模的一个偏振分量)的耦合实验得到了28% 耦合效率。文章最后讨论了半导体激光器的椭圆性和固有象散以及光反射对耦合造成的影响。 相似文献
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Jinchen Zhou Daofu Wu Changqing Tian Zhiyu Liang Hongmei Ran Bo Gao Zhongtao Luo Qiang Huang Xiaosheng Tang 《Small (Weinheim an der Bergstrasse, Germany)》2023,19(27):2207915
Lead halide perovskite materials have great potential for photocatalytic reaction due to their low fabrication cost, unique optical absorption coefficient, and suitable band structures. However, the main problems are the toxicity and instability of the lead halide perovskite materials. Therefore, a facile synthetic method is used to prepare lead-free environmentally friendly Cs2TiX6(X = Cl, Cl0.5Br0.5, Br) perovskite materials. Their structural and optical characteristics are systematically investigated. The band gaps of the produced samples are illustrated to be from 1.87 to 2.73 eV. Moreover, these materials can keep high stability in harsh environments such as illumination and heating, and the Cs2Ti(Cl0.5Br0.5)6 microcrystals demonstrate the yields of 176 µmol g−1 for CO and 78.9 µmol g−1 for CH4 after light irradiation for 3 h, which is of the first report of Ti-based perovskite photocatalysts. This finding demonstrates that the Ti-based perovskites will create opportunities for photocatalytic applications, which may offer a new idea to construct low-cost, eco-friendly, and bio-friendly photocatalysts. 相似文献