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Compact Intracavity Spectroscopy Without a Detector

Scientists at the Pacific Northwest National Laboratory (PNNL) have developed a new Mid-IR sensing technique that is simpler and inherently more compact than related tunable laser absorption spectroscopy (TLAS) techniques. At the heart of the concept is a broad tuning external cavity quantum cascade laser (EC-QCL). The innovative aspect is the use of a recently patented technique called EC-QCL Voltage Intracavity Sensing (EVIS), which eliminates the need for both an external gas cell and a detector. In addition to its compact size, this concept also enables rapid (10 Hz) simultaneous measurement of several different species, including molecules with broad absorption features. OptoKnowledge is currently collaborating with PNNL to transition this technology for commercial applications.

EVIS sensor concept developed and demonstrated by PNNL
EVIS sensor concept developed and demonstrated by PNNL.


Relevant Publications:
M. C. Phillips, M. S. Taubman, J. M. Kriesel, "Use of external cavity quantum cascade laser compliance voltage in real-time trace gas sensing of multiple chemicals", Proceedings of SPIE Vol. 9370, 93700Z (2015).

M. C. Phillips, and M. S. Taubman, “Intracavity sensing via compliance voltage in an external cavity quantum cascade laser,” Opt. Lett., 37(13), 2664-2666 (2012).

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