Broadband Distributed Feedback Quantum Cascade Laser Array Using A Heterogeneous Cascade

Diehl, Laurent; Lee, B.G.; Zhang, H.A.; Pflügl, C.; Belkin, Mikhail; Fisher, M.; Wittman, A.; Faist, Jérôme; Capasso, Federico

doi:10.1364/cleo.2009.ctht1

Cited by 2 publications

(1 citation statement)

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“…The wavelength region between 6.5 -10.5 µm (1540 -950 cm −1 ) is ideal for sensitive and specific detection of explosives, CWAs [5], and other hazardous materials because the region generally encompasses the most strongly absorbing features within those molecules. At the core of the present approach to producing such breadth in that region is the DFB QCLA [6][7][8]. First developed by Capasso and associates, the near-continuously tunable QCLA source is fully monolithic and offers significant advantages compared to other broadband tunable sources, such as External Cavity QCLs.…”

Section: Light Source: Quantum Cascade Laser Arraysmentioning

confidence: 99%

Portable standoff spectrometer for hazard identification using integrated quantum cascade laser arrays from 65 to 11 µm

et al. 2018

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This article presents new spectroscopic results in standoff chemical detection that are enabled by monolithic arrays of Distributed Feedback (DFB) Quantum Cascade Lasers (QCLs), with each array element at a slightly different wavelength than its neighbor. The standoff analysis of analyte/substrate pairs requires a laser source with characteristics offered uniquely by a QCL Array. This is particularly true for time-evolving liquid chemical warfare agent (CWA) analysis. In addition to describing the QCL array source developed for long wave infrared coverage, a description of an integrated prototype standoff detection system is provided. Experimental standoff detection results using the man-portable system for droplet examination from 1.3 meters are presented using the CWAs VX and T-mustard as test cases. Finally, we consider three significant challenges to working with droplets and liquid films in standoff spectroscopy: substrate uptake of the analyte, time-dependent droplet spread of the analyte, and variable substrate contributions to retrieved signals.

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