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In the paper we present a new approach to development of a time-domain (pulse Furier-transform) spectroscopy method in subTHz and THz frequency ranges with maximal sensitivity and spectral resolution. In our studies we obtained harmonics up to 2.7 THz with application of multipliers based on quantum superlattice structures. Our spectrometer includes subTHz and THz emission sources based on phase-stabilized Gunn generators and quantum superlattice structures multipliers and mixers (up-converter). This approach ensures narrow instrumental linewidth less than 10 kHz over the operating range of the spectrometer as well as development of software for computer control and data acquisition. In the paper we propose two possible schemes of spectrometers realization. These variants of spectrometer are suitable, in particular, for atmospheric investigations, including detection of water, acetone, NO, CO etc.

THz emission; THz spectroscopy; frequency multiplication; multiplier; source