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Terahertz time-domain spectroscopy (TDS) is a powerful technique in which picosecond long pulses of terahertz radiation (THz) are used to investigate the sample of interest. It allows time-resolved measurements of the THz electric field with standardly achieved signal-to-noise ratios in the order of 103 and its coherent nature of detection enables the determination of the amplitude and phase from a single time-domain scan. Merging this method with optical gain media in the THz frequency range, namely quantum cascade lasers (QCL), opens the door to a wide range of sensing applications and additionally allows the extension of TDS systems in terms of spectral coverage and SNR.
© 2015 IEEE
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