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Electroluminescence spanning 3.3μm to 12.5μm and with a full width half maximum of 4μm is achieved using a single stack quantum cascade gain medium. The free-running laser emits from 7.4μm to 12.1μm.
In the present paper, a chip with a Pt-based RTD that functions as a heater and sensor is tested under serial power loads, and infrared (IR) thermal imaging system is adopted to obtain the thermal measurement. Comparisons of the hotspot temperatures of the chip obtained by RTD and IR methods have been made, where different surfaces of the chip were observed by the IR camera. Combing with the heat...
In the present paper, a chip with a Pt-based RTD that functions as a heater and sensor is tested under serial power loads, and infrared (IR) thermal imaging system is adopted to obtain the thermal measurement. Comparisons of the hotspot temperatures of the chip obtained by RTD and IR methods have been made, where different surfaces of the chip were observed by the IR camera. Combing with the heat...
Two different ultra-strong coupling Quantum Cascade laser designs and their modified versions with two taller electron exit barriers are compared experimentally to study the influence of such taller electron exit barriers on the device performance.
IGBTs have the advantages of BJTs and MOSFETs, they are widely used in household appliances and industrial production. But thermal problem has affected the development of IGBT, so its accurate measurement of thermal resistance and temperature rise is very important. In this paper, we propose a new test system for thermal resistance of IGBT, in this test system, we use digital approach, choose the...
A thermoelectric effect is observed in quantum cascade lasers and validated through thermal/electrical transport modeling. Choosing the proper polarity leads to an active core heat reduction of 9 K for a 7.5 kW/cm2 thermal load.
We demonstrate a Quantum Cascade Laser employing ultra-strong (~20 meV) coupling between the injector and the upper laser state. The laser shows a pulsed wall-plug efficiency of 34%(8%) and peak power of 8.0 W(2.0 W) at 80 K(300 K).
Using low-duty cycle pulses superimposed on a DC current, we determine the type of power roll-over and obtain the instantaneous threshold current, current efficiency and core temperature of a quantum-cascade laser in continuous wave operation.
We demonstrate a quantum cascade laser featuring a low-voltage-defect short injector. Devices showing a voltage-defect as low as 20 meV and voltage efficiency of 88% at 80 K are reported, with > 80% voltage efficiency at room temperature.
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