Applications using high-Tc superconducting terahertz emitters

Using recently-developed THz emitters constructed from single crystals of the high- T c superconductor Bi 2 Sr 2 CaCu 2 O 8+ δ , we performed three prototype tests of the devices to demonstrate their unique characteristic properties for various practical applications. The first is a compact and simple transmission type of THz imaging system using a Stirling cryocooler. The second is a high-resolution Michelson interferometer used as a phase-sensitive reflection-type imaging system. The third is a system with precise temperature control to measure the liquid absorption coefficient. The detailed characteristics of these systems are discussed.