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This presentation presents the spectroscopic concepts and results enabled by arrays of Distributed Feedback (DFB) QCLs, with each element at a slightly different wavelength than its neighbor. In optical systems, such as standoff detectors and in situ gas analyzers, this increases analyte sensitivity and selectivity by broadening spectral source coverage and by allowing for extremely fast all-electronic...
We demonstrate transmission spectroscopy between a monostatic transceiver based on a wavelength-beam-combined quantum-cascade-laser array and a retroreflector placed at 35 meters.
An ultra-broadband distributed-feedback quantum cascade laser array was fabricated, using a heterogeneous cascade based on two bound-to-continuum designs centered at 8.4 and 9.6 mum. This array emitted in a range over 220 cm-1 near a 9-mu m wavelength, operated in pulsed mode at room temperature. The output power of the array varied between 100- and 1100-mW peak intensity.
We demonstrated an array of distributed feedback quantum cascade lasers covering a spectral range of 220 cm-1. The variability in threshold current and slope efficiency is explained in terms of the position of the laser end facets.
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