Abstract:We report on a study to determine the effect of waveguide side-wall roughness on Quantum Cascade (QC) laser performance, such as threshold current density, slope efficiency, far-field beam pattern and group refractive index, using two two-wavelength heterogeneous cascade QC laser structures, one with emission wavelengths of 7.0 μm/11.2 μm, and the other with 8.7 μm /12.0 μm. For the range of roughness standard deviation values from about 0.4 μm to 1.0 μm for which all four QC lasers were operating, the thresho… Show more
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