Interference experiments with a coherent tunable THz nipnip superlattice photomixer

To date, THz radiation is mainly generated by pulsed sources. However, these are very expensive and bulky as strong solid-state pump sources are required to provide sufficient power. Additionally, the linewidth of the THz signal from pulsed systems is always Fourier-transform-limited in contrast to a CW THz source. We present a semiconductor based, room-temperature operating and frequency tunable CW system, based on photomixing with InGaAs nip nip-devices to generate the THz radiation.