Quantum cascade lasers with Y2O3 insulation layer operating at 8.1 mu m

Abstract

SiO2 is a commonly used insulation layer for QCLs but has high absorption peak around 8 to 10 mu m. Instead of SiO2, we used Y2O3 as an insulation layer for DC-QCL and successfully demonstrated lasing operation at the wavelength around 8.1 mu m. 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. (C) 2017 Optical Society of America