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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.
A monolithic tunable single mode terahertz quantum cascade laser source based on intra-cavity difference frequency generation with a tuning range of ∼580 GHz is demonstrated at room temperature.
We demonstrate monolithic tunable terahertz quantum cascades laser sources with a tuning range over 580 GHz at room temperature by integrating electrically separated distributed feedback section and distributed Bragg reflector section into a single device.
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.
Perishables are increasingly important for grocery retailers as they have become a main reason for many consumers to choose where to shop. However, perishable food waste stemmed from inappropriate quality control and excessive inventories that have to be either marked down before the “sell-by-date” or thrown away after the date, remains a major challenge in grocery retail chains. Recent advances in...
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).
Varying quantum cascade laser cavity length results in gain peak selection across a 118 cm-1 range; a result of a change in threshold voltage, and applied electric field as a function of cavity length.
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.
It is important to comprehend the interruption phenomenon of contact materials for aiming at adaptation to high voltage of vacuum circuit breakers. Then, we carried out measurement of arc energy and anode surface temperature and observation of vacuum arc by using the vacuum chamber. Moreover, we made prototype of new contact materials that was based on these tests result. And these contact materials...
Temperature-dependent optical gain and waveguide loss have been measured for continuous-wave operated quantum-cascade lasers with wavelengths between 8.2 and 10.2 mum up to room temperature using the Hakki-Paoli method. The gain coefficient decreases with increasing temperature, and is close to the designed value for vertical transition lasers, but smaller than the designed value for diagonal transition...
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