1,721,224 research outputs found
2-D temperature mapping of vertical-cavity surface-emitting lasers determined by microprobe electroluminescence
No full textSpatially resolved temperature increase of vertical-cavity surface-emitting lasers associated with different current injection conditions is reported. This information is unambiguously extracted by comparing the thermal shift of the spontaneous electroluminescence peaks transmitted through the Bragg mirrors under pulsed and steady state operation. Comparison with the temperature increase estimated by the a usual wavelength shift of the laser line under the same operating conditions clearly shows the capability of the proposed technique
Laser a cascata quantica operanti nel lontano infrarosso: progettazione, fabbricazione e studio delle caratteristiche elettriche, ottiche, elettroniche, termiche e vibrazionali
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Demonstratioof high wall plug efficienzy THz QCLs:investiation of the optical, electronic and thermal performance
No full textThermal modelling of GaInAs/AlInAs quantum cascade lasers
No full textWe measured the facet temperature profiles of GaInAs/AlInAs quantum cascade lasers QCLs
operating in continuous wave mode by means of microprobe photoluminescence. These results were
used to evaluate the in-plane k and the cross-plane k thermal conductivities of the active region
and to validate a two-dimensional model for the anisotropic heat diffusion in QCLs. In the
temperature range of 80–250 K, k monotonically increases with temperature and remains one
order of magnitude smaller than the thermal conductivities of bulk constituent materials. We found
an excellent agreement between the calculated and experimental values of the thermal resistance of
GaInAs/AlInAs QCLs operating in continuous wave up to 400 K. Comparison between the
calculated thermal performances of QCLs sharing the same active region structure, but having either
a buried or a ridge waveguide, shows that devices with Au contact layers thicker than 4 m have
better thermal properties than the buried structures
Analysis of the key parameters affecting the high temperature operation of the terahertz science and tecnology
No full textHigh-performance terahertz quantum cascade lasers operating at 106 μm: anlysis of the thermal and electronic properties
No full textTime resolved u-photoluminesence assessment of the heat transfer processes in quantum cascade lasers
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