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We demonstrate diffuse-reflectance (DR) spectroscopy of powders using a discretely-tunable terahertz-frequency quantum cascade laser (THz QCL) with a heterogeneous active region. DR signatures were obtained at frequencies of 3.06, 3.21, 3.28, and 3.35 THz, and the relative absorption coefficients were inferred at each frequency using a Kubelka–Munk (KM) scattering model. The spectral lineshapes reproduce...
A heterogeneous THz-QCL is used for diffuse-reflectance imaging of powdered solids at 4 frequencies in the range 3.05–3.35 THz. An effective-optical-path-length model reproduces TDS absorption spectra accurately and discriminates between admixtures of materials with differing concentrations.
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