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Article
Mode-hop compensation for intracavity sensing via chip voltage in an external-cavity QCL
In this paper, we describe a technique to perform intracavity gas sensing by detecting changes in the QCL voltage. The influence of mode-hops is compensated by a data acquisition and processing based on a dual...
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Article
Open AccessPrivate communication with quantum cascade laser photonic chaos
Mid-infrared free-space optical communication has a large potential for high speed communication due to its immunity to electromagnetic interference. However, data security against eavesdroppers is among the o...
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Article
Open AccessChaotic optical power dropouts driven by low frequency bias forcing in a mid-infrared quantum cascade laser
Mid-infrared quantum cascade lasers operating under external optical feedback and external periodic bias forcing are shown to exhibit a deterministic chaotic pattern composed of frequencies which are linked to...
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Article
Multi-gas sensing with quantum cascade laser array in the mid-infrared region
Wide tunable lasers sources are useful for spectroscopy of complex molecules that have broad absorption spectra and for multiple sensing of smaller molecules. A region of interest is the mid-infrared region, w...
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Article
Open AccessBeam sha** in high-power broad-area quantum cascade lasers using optical feedback
Broad-area quantum cascade lasers with high output powers are highly desirable sources for various applications including infrared countermeasures. However, such structures suffer from strongly deteriorated be...
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Article
Open AccessChaotic light at mid-infrared wavelength
The onset of nonlinear dynamics and chaos is evidenced in a mid-infrared distributed feedback quantum cascade laser both in the temporal and frequency domains. As opposed to the commonly observed route to chao...
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Article
Open AccessMagnetotransport in quantum cascade detectors: analyzing the current under illumination
Photocurrent measurements have been performed on a quantum cascade detector structure under strong magnetic field applied parallel to the growth axis. The photocurrent shows oscillations as a function of B. In or...
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Article
An FDTD approach to the simulation of quantum-well infrared photodetectors
A Finite Difference Time Domain approach is used to design and to optimize quantum-well based infrared photodetectors. Results showing the influence of some parameters on the performance of these devices are p...
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Article
Photonic Metal Bandgap Structure for Intersubband Detection
We would like to present here a geometry of Quantum Well Infrared Photodetectors (QWIPs) for increasing the detectivity. It consists of a mesa (a squared etched pixel) with a metal grating on top of it. The grati...
