Quantum cascade lasers with Y₂O₃ insulation layer operating at 8.1 µm

SiO₂ is a commonly used insulation layer for QCLs but has high absorption peak around 8 to 10 µm. Instead of SiO₂, we used Y₂O₃ as an insulation layer for DC-QCL and successfully demonstrated lasing operation at the wavelength around 8.1 µm. We also showed 2D numerical analysis on the absorption coefficient of our DC-QCL structure with various parameters such as insulating materials, waveguide width, and mesa angle.