Spectral imaging at 5.7 THz

We report a development of a coherent, tunable, 100kW parametric source at $\sim 6$ THz for high-resolution imaging in comparison with a similar source at $\sim 2$ THz. To take advantage of the tunable coherent source, we also report spectrally resolved imaging between 5.55 and 5.87 THz to reveal the spectroscopic characteristics of Aprovel, which is an important medicine for blood pressure control.