Mid-infrared absorption spectroscopy using quantum cascade lasers

Fred Haibach; Adam Erlich; Erik Deutsch

doi:10.1117/12.884523

12 May 2011 Mid-infrared absorption spectroscopy using quantum cascade lasers

Fred Haibach, Adam Erlich, Erik Deutsch

Proceedings Volume 8032, Next-Generation Spectroscopic Technologies IV; 803208 (2011) https://doi.org/10.1117/12.884523
Event: SPIE Defense, Security, and Sensing, 2011, Orlando, Florida, United States

Abstract

Block Engineering has developed an absorption spectroscopy system based on widely tunable Quantum Cascade Lasers (QCL). The QCL spectrometer rapidly cycles through a user-selected range in the mid-infrared spectrum, between 6 to 12 μm (1667 to 833 cm^-1), to detect and identify substances on surfaces based on their absorption characteristics from a standoff distance of up to 2 feet with an eye-safe laser. It can also analyze vapors and liquids in a single device. For military applications, the QCL spectrometer has demonstrated trace explosive, chemical warfare agent (CWA), and toxic industrial chemical (TIC) detection and analysis. The QCL's higher power density enables measurements from diffuse and highly absorbing materials and substrates. Other advantages over Fourier Transform Infrared (FTIR) spectroscopy include portability, ruggedness, rapid analysis, and the ability to function from a distance through free space or a fiber optic probe. This paper will discuss the basic technology behind the system and the empirical data on various safety and security applications.

Citation Download Citation

Fred Haibach, Adam Erlich, and Erik Deutsch "Mid-infrared absorption spectroscopy using quantum cascade lasers", Proc. SPIE 8032, Next-Generation Spectroscopic Technologies IV, 803208 (12 May 2011); https://doi.org/10.1117/12.884523

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