On the Possibility of Advancement of the Non-Stationary Gas Spectroscopy Method Realized by Using Fast Frequency Sweep Mode Up the Terahertz Frequency Range

Fast frequency sweep mode is a promising method for spectrum recording in a sufficiently wide frequency range within a short time (about a few milliseconds). This approach permits one to detect all substances which have intense absorption lines lying in the frequency range of the spectrometer and which are in a gas mixture when the spectrum is recorded. A spectroscopic system consisting of spectrometers for the centimeter and two-millimeter wavelength ranges operating in fast frequency sweep mode is presented. The possibility of creating a radiation source with fast frequency sweep based on a quantum cascade laser of the terahertz frequency range is explored. The results of numerical simulation for such a source based on experimental characteristics of the studied quantum cascade laser are given. The possibility of using these spectrometers to examine the composition of a mixture of vapors and thermal decomposition products of the tissues of ENT organs is shown.