Novel Concept of Frequency-Combs Interferometric Spectroscopy in the Mid-IR for Significantly Enhanced Detection of Explosives
Technical Report,01 May 2014,30 Sep 2015
University of Central Florida Orlando United States
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Our work over the reporting period has resulted in the demonstration of high performance spectroscopic sensor based on mid-IR frequency combs. Ultrasensitive detection of methane, isotopic carbon dioxide, carbon monoxide, formaldehyde, acetylene, and ethylene was performed in the spectral range 2.5-5 microns using intracavity spectroscopy in broadband optical parametric oscillators OPOs. The OPOs were operated near degeneracy and synchronously pumped either by a mode-locked erbium 1560 nm or thulium 2050 nm fiber laser. A large instantaneous bandwidth of up to 1000 cm-1 allows for detection of several substances simultaneously.