LongWave Photonics provides terahertz Quantum Cascade Laser (QCL) systems for imaging, spectroscopy and heterodyne receivers. Milliwatt average power levels are available in a range of frequencies from 1.9 to 5 THz.  Our compact systems are turnkey, operate cryogen free and require no optical alignment.  THz QCL devices are available in multi-mode Fabry-Perot or single frequency distributed feedback (DFB) devices.