高温超导约瑟夫森效应演示仪

<正>设备组成:测量仪+样品+测量杆;测量仪:高温超导约瑟夫森效应演示仪微波源:固态微波发生器;频段:10GHz;最大输出功率:80mW;衰减器:最大衰减20dB;样品:高温超导晶界约瑟夫森结尺寸:10mm×10mm×1mm;工作温度:77K(液氮沸点温度)测量杆:采用快速真空接头的漏热式恒温器;工作温度:300K至77K;性能指标:能测量、显示高温超导约瑟夫森结和超导体的临界转变温度Tc和交直流约瑟夫森效应(约瑟夫森结的Ⅰ-Ⅴ曲线)。配置一些其它部件还可显示约瑟夫森电流随磁场的     

Hybrid Mach-Zehnder interferometric sensor based on two core-of fset attenuators and an abrupt taper in single-mode fiber

This study proposes a new hybrid Mach-Zehnder interferometric(MZI) sensor based on two core-offset attenuators and an abrupt taper in a single-mode fiber fabricated by a fiber-taper machine and electric arc discharge. When the distance between the two core-offset attenuators is stretched to 4500 μm, significant interference signals are detected with a prominent attenuation peak of ～28 dB. The proposed MZI can be used to measure temperature due to its low refractive index(RI) and strain cross-sensitivity. The temperature sensitivity is 34.95±0.04 and 106.70±0.04 pm/℃ in the temperature ranges of 14-250 and250-1000 ℃, respectively.     

变角度薄膜衰减器的应用研究

对可应用于神光Ⅱ精密化项目的变角度薄衰减器进行了理论分析、数值计算,在小激光装置上进行了闭环自动衰减控制实验。模拟实验证实了该衰减器具有精密连续可调、大口径、高能量负载、高光束质量的特点,这是其它光学衰减器难以做到的。