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In this work, an optical modulation spectroscopy technique: thermoreflectance has been employed to study temperature distributions on the surface of optically pumped vertical external cavity surface emitting lasers (VECSELs). The thermoreflectance is based on the relative change of reflectivity of the sample induced by the change of its temperature. In this case the temperature change of the sample...
The development of molecular-beam epitaxy (MBE) of GaAs/AlGaAs heterostructures, used for fabrication of ∼9μm quantum cascade lasers (QCLs), is reported. The X-ray diffractometry (XRD) structural characterization, as an integral part of this process, is presented as well. Some conclusions, concerning the relationships between the used type of epitaxial technology and the necessity of special procedures...
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