L. Nugent-Glandorf, T. Neely, T. Johnson, S. Diddams
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A difference-frequency based mid-IR broadband source for surface spectroscopy of explosives
We describe a 2.8–4.4 μm tunable difference-frequency based mid-IR broadband source. With a FWHM of 170 nm centered at 3.3 μm, we have investigated the C-H stretch signatures of solid-phase trace explosives on surfaces.