Abstract
Using YBa2Cu3O7−δ/MgO bicrystal Josephson junction, we have developed a setup for spectrum analyses of terahertz signals, up to 2.5 THz, with a frequency resolution of 3 GHz. The junction works at liquid nitrogen temperature when the signal frequencies are low while for signals at 1.6 THz and 2.5 THz the junction is cooled to 6 K. Digital signal processing (DSP) chips are made use of to build a data acquisition and processing system so that it can be compact, fast, and intelligent. With the completion of the relevant hardwares and softwares, the measurements are now automated.
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