In this work, we demonstrated real-time spectroscopy using a discreetly and fast wavelength tunable injection-seeded THz wave parametric generator (is-TPG). In our is-TPG, pump and seed beams shine the MgO:LiNbO3 crystal to generate the THz wave. At that time, the wavelength was tuned by changing the wavelength of the seed beam. Therefore, in order to achieve real-time measurement, we introduced fast wavelength switchable ECDL that we developed recently using a digital micromirror device (DMD) as a wavelength selector. As a result of this improvement, we achieved to identify the reagents hidden in cardboard box in real-time.
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