A continuous measurement of the farhyphen;infrared frequency response of a point contact Josephson junction is performed between 0.7 and 2 THz. The response at increasing frequencies present three characteristic regions with variations proportional tofminus;2,thinsp;fminus;4,thinsp;fminus;6. They illustrate the losses introduced successively at increasing frequencies by the resistively shunted junction model, the junctionRCtime constant and the attenuation of the Josephson current above the gap frequency.
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