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1 July 2003 Quantum cascade transmitters for ultrasensitive chemical agent and explosives detection
John F. Schultz, Matthew S Taubman, Warren W Harper, Richard M Williams, Tanya L Myers, Bret D. Cannon, David M. Sheen, Norman C. Anheier Jr., Paul J. Allen, S. K. Sundaram, Bradley R. Johnson, Pamela M. Aker, Ming C Wu, Erwin K. Lau
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Proceedings Volume 4999, Quantum Sensing: Evolution and Revolution from Past to Future; (2003) https://doi.org/10.1117/12.485542
Event: Integrated Optoelectronics Devices, 2003, San Jose, CA, United States
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.
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John F. Schultz, Matthew S Taubman, Warren W Harper, Richard M Williams, Tanya L Myers, Bret D. Cannon, David M. Sheen, Norman C. Anheier Jr., Paul J. Allen, S. K. Sundaram, Bradley R. Johnson, Pamela M. Aker, Ming C Wu, and Erwin K. Lau "Quantum cascade transmitters for ultrasensitive chemical agent and explosives detection", Proc. SPIE 4999, Quantum Sensing: Evolution and Revolution from Past to Future, (1 July 2003); https://doi.org/10.1117/12.485542
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KEYWORDS
Quantum cascade lasers
Modulation
Frequency modulation
Absorption
Sensors
Fermium
Signal detection
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