Setups for measuring the beat of two 1 THz waves

This article describes the design of the measurement setups, thanks to which it will be possible to measure the power of the electromagnetic wave resulting from the beat of two terahertz waves with similar frequency generated by different methods. The first terahertz wave is created as a result of repeated frequency multiplication, while the second one is generated in the photomixer by the beat of two light waves coming out of the diode lasers. The other components of the measurement setup are a wideband antenna, band amplifier and a precise radio frequency (RF) receiver with a picowatt sensitivity.