Study of Generation and Detection of Continuous Terahertz Wave Using Chaotic Multi-mode Semiconductor Laser

A 650-nm chaotically oscillating multi-mode semiconductor laser was used to generate and detect a stable continuous terahertz signal from a photoconductive antenna. The intensity of the generated terahertz was ~10 times stronger compared to the excitation without chaotic oscillations. The frequency comb-type spectrum is obtained in the sub-terahertz region, which makes terahertz time-domain spectroscopy systems with this kind of economically superior laser very promising for the evaluation of 5G and 6G components.