Application of the high-Tc superconducting terahertz emitter to precise material research

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Using the high-Tc superconducting terahertz emitter, we developed a parameter-free system to measure the absorption coefficients of liquid samples in sub-terahertz frequency region. This allows us to get the absorption coefficient of water within 1% error at around 0.5 THz. Making a sample holder which allows the temperature to set between 5 and 70 degrees centigrade, we studied the absorption coefficient of Na2CO3 solution as functions of the concentration and temperature. We have also succeeded to modify the high-Tc superconducting terahertz emitter to work in liquid nitrogen, and developed a helium-free measurement system with a Schottky barrier diode detector.