SINGLE-FREQUENCY QUANTUM-CASCADE TERAHERTZ LASER Russian patent published in 2025 - IPC H01S5/323 

FIELD: electricity.

SUBSTANCE: invention relates to the technology of creating quantum-cascade lasers of the terahertz range (THz QCL) with possibility of operation in single-frequency generation mode. Method of achieving single-frequency generation of THz QCL is based on creation of two optically coupled sections in a double metal waveguide, i.e. laser mode should propagate in a two-section waveguide. Such optical communication can be achieved when the distance between two sections of the double metal waveguide (“air gap”) is less than 10 mcm. Two sections of waveguide are made from active medium of laser (multilayer heterostructure GaAs/AlGaAs or InGaAs/AlGaAs) and represent an active section, where laser radiation is generated during current injection, and a passive section, which performs selection of laser modes, i.e. supports the existence of one longitudinal mode of the FP resonator.

EFFECT: generation of terahertz radiation on one longitudinal mode of Fabry-Perot resonator.

1 cl, 4 dwg