PT Journal AU Akalin, T TI Terahertz sources: Powerful photomixers SO Nature Photonics JI Nat. Photon. PY 2012 BP 81 VL 6 IS 2 DE fromIPMRAS AB An efficient continuous-wave source of terahertz radiation that combines the outputs from two near-infrared semiconductor lasers in a novel photomixer looks set to benefit applications in spectroscopy and imaging. ER