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Proceedings Paper

Quantum cascade transmitters for ultrasensitive chemical agent and explosives detection
Author(s): John F. Schultz; Matthew S Taubman; Warren W Harper; Richard M Williams; Tanya L Myers; Bret D. Cannon; David M. Sheen; Norman C. Anheier; Paul J. Allen; S. K. Sundaram; Bradley R. Johnson; Pamela M. Aker; Ming C Wu; Erwin K. Lau
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Paper Abstract

The small size, high power, promise of access to any wavelength between 3.5 and 16 microns, substantial tuning range about a chosen center wavelength, and general robustness of quantum cascade (QC) lasers provide opportunities for new approaches to ultra-sensitive chemical detection and other applications in the mid-wave infrared. PNNL is developing novel remote and sampling chemical sensing systems based on QC lasers, using QC lasers loaned by Lucent Technologies. In recent months laboratory cavity-enhanced sensing experiments have achieved absorption sensitivities of 8.5 x 10-11 cm-1 Hz-1/2, and the PNNL team has begun monostatic and bi-static frequency modulated, differential absorption lidar (FM DIAL) experiments at ranges of up to 2.5 kilometers. In related work, PNNL and UCLA are developing miniature QC laser transmitters with the multiplexed tunable wavelengths, frequency and amplitude stability, modulation characteristics, and power levels needed for chemical sensing and other applications. Current miniaturization concepts envision coupling QC oscillators, QC amplifiers, frequency references, and detectors with miniature waveguides and waveguide-based modulators, isolators, and other devices formed from chalcogenide or other types of glass. Significant progress has been made on QC laser stabilization and amplification, and on development and characterization of high-purity chalcogenide glasses, waveguide writing techniques, and waveguide metrology.

Paper Details

Date Published: 1 July 2003
PDF: 18 pages
Proc. SPIE 4999, Quantum Sensing: Evolution and Revolution from Past to Future, (1 July 2003); doi: 10.1117/12.485542
Show Author Affiliations
John F. Schultz, Pacific Northwest National Lab. (United States)
Matthew S Taubman, Pacific Northwest National Lab. (United States)
Warren W Harper, Pacific Northwest National Lab. (United States)
Richard M Williams, Pacific Northwest National Lab. (United States)
Tanya L Myers, Pacific Northwest National Lab. (United States)
Bret D. Cannon, Pacific Northwest National Lab. (United States)
David M. Sheen, Pacific Northwest National Lab. (United States)
Norman C. Anheier, Pacific Northwest National Lab. (United States)
Paul J. Allen, Pacific Northwest National Lab. (United States)
S. K. Sundaram, Pacific Northwest National Lab. (United States)
Bradley R. Johnson, Pacific Northwest National Lab. (United States)
Pamela M. Aker, Pacific Northwest National Lab. (United States)
Ming C Wu, Univ. of California/Los Angeles (United States)
Erwin K. Lau, Univ. of California/Los Angeles (United States)


Published in SPIE Proceedings Vol. 4999:
Quantum Sensing: Evolution and Revolution from Past to Future
Manijeh Razeghi; Gail J. Brown, Editor(s)

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