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Project progress was significantly delayed due to partial lockdown in 2020 related to covid-19. The resulting delay required further work into the beginning of 2022 (during the cost-neutral project prolongation) to complete the planned tasks. All the tasks and milestones have been thus fully completed. The project has resulted in fabrication of numerous Quantum Cascade Laser (QCL) wafers and an actual operating devices; in development of highly-efficient broad-gain design with power conversion efficiency above 6% in a number of low-threshold designs for the targeted spectral range of 8-to-9.5 1/4 m; and in the demonstration of a reliable mode restriction to the single TM00 in the broad-area tapered waveguides with the taper widths up to 100 m (again supporting our theoretical predictions). The broad QCL-design and device-fabrication experience obtained in the project will be implemented within other current and future development projects.