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In this paper, the influence of the simplifications made in the four-equation-based set of rate equations describing the dynamic behavior of a quantum cascade laser (QCL) is studied. Numerical simulations based on the set of four rate equations has been developed, enabling the theoretical study of the influence of different parameters on the direct modulation response of the laser. These equations...
This paper presents a CW raster-scanning THz imaging setup used to perform Non-Destructive Testing of Kevlar™ and carbon fibre samples. The setup uses a 2.5 THz Quantum Cascade Laser as a source. Delamination defect in a Kevlar sample was detected showing a sensitivity to laser polarization orientation. Detection of a break in a carbon/epoxy sample was also performed.
This paper is a presentation of the on going research at OLIMPES laboratory in the field of active imaging using THz Quantum Cascade Lasers applied to composite materials diagnostic. We have performed transmission measurements on various types of materials, most of them used in aeronautical engineering. We present some transmission mode images realized to investigate the possibility to use THz imaging...
We present a new modeling of the direct modulation response of a quantum cascade laser (QCL), using the complete set of rate equations describing its behavior. We show in the first part that the bandwidth could not be as high as it has been proposed in previous work. The second part describes the experimental setup to access the dynamic behavior of the QCL thanks to a non linear transfer onto a telecom...
Based on simplified rate equations, both static and dynamic behaviour have been studied in order to characterize 2.9THz QCLs that will be used in detection or transmission systems. Comparison of expected static behaviour and experimental one shows good correspondence. We have been able to extract a semi-empirical law of evolution of the threshold current with temperature and link it with the optical...
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