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Linear cavity optical-feedback cavity-enhanced absorption spectroscopy with a quantum cascade laser

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Abstract

A cw distributed feedback quantum cascade laser (DFB-QCL) coupled to a two-mirror linear optical cavity has been used to successfully demonstrate optical-feedback cavity-enhanced absorption spectroscopy (OF-CEAS) at 5.5 μm. The noise-equivalent absorption coefficient, αmin, was 2.4×108cm1 for 1 s averaging, limited by etalon-fringing. The temporal stability of the instrument allows NO detection down to 5 ppb in 2 s.

© 2013 Optical Society of America

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