Optimization of technology of long wavelength (λ~13μm) quantum cascade lasers grown by MBE

In this work optimization of technology of QCLs operating at λ~13 µm wavelength is presented. The devices were grown by Molecular Beam Epitaxy and combined MBE and MOVPE overgrowth. Room temperature operation of QCLs was achieved. The influence of the waveguide design in terms of thickness, growth conditions as well as doping has been studied. We have performed electro-optical and spectral characterization of LWIR QCL extracting crucial device parameters. The analysis of laser parameters is presented. Additional results of single mode operation are presented for devices in coupled cavity configuration. Acknowledgements: This work was supported by Polish National Science Centre (NCN) grant: SONATA BIS: UMO-2021/42/E/ST7/00263