Electrical tuning of single-mode terahertz quantum-cascade lasers operating at high temperatures

摘要

An electrical tuning method for terahertz quantum-cascade lasers (QCLs) is developed based on detuned intersubband absorption in coupled metallic microcavities, which works even at high operating temperatures. Continuous 4 GHz tuning for a single-mode narrow-beam 3.57 THz QCL operating at ~ 50 K in a Stirling cryocooler is demonstrated.