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(a) Schematic representation of the substrate-emitting quantum cascade laser. (b) Scanning electron micrograph of the gratings and channels etched into the top layers of the laser wafer. The ridge in the center is wide.
Power vs current characteristics for the substrate-emitting QCL measured at different temperatures. The inset shows the corresponding temperature dependence of the threshold current.
Spectral behavior of the substrate-emitting QCL with respect to (a) temperature and (b) current at a temperature of .
Beam profile data. The low-divergence profile was obtained from the longitudinal aperture and the wide-divergence profile was obtained from the ridge-width aperture (i.e., ).
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