High-Quality Tunable Terahertz-Wave Generation
Abstract: Waves in the Terahertz (THz), or submillimeter range of the electromagnetic spectrum (0.3 – 3 THz) have a lot of possible applications. Explosives, drugs and poisons have characteristic absorption lines in this region and THz-waves can be used to count money, for crack detection, to see through fog and clouds and many more. However, much more interesting fields for the application of THz-waves are astronomy and communications. In the transmission windows above 300 GHz the wireless transmission of data rates of several terabit per second will be possible. This is by orders of magnitude more than the data rates transmittable in the wireless channels used for the cellular and wireless local area networks of today. Furthermore, up to now the THz region is unregulated, enabling the possibility to establish new wireless services.
For the generation of THz-waves Gunn diodes and Quantum cascade lasers have been introduced for instance. However, for communications narrow linewidth, tunable sources with a very high quality and stability are required. In the talk a new scheme for the generation of ultranarrow (linewidth < 1 Hz), tunable (80 MHz – 30 THz) THz-waves with very low phase noise will be discussed. This new source of THz-waves could have the potential to be used for the above mentioned or for completely new THz applications.