D. Molter, J. Klier, S. Weber1, M. Kolanol, J. Jonuscheit, G. von Freymann
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| Scheme of the sampling principle of time-domain spectroscopy. By variation of the optical delay using the delay line, the time section, in which the detector is active, is shifted with respect to the incident terahertz pulse. As this active time is much shorter than the terahertz pulse, this results in a sampling of the time-dependent electric field. From the time-dependent electric field, the spectrum can be calculated via fast Fourier transformation. |
https://aip.scitation.org/doi/full/10.1063/5.0037395
Terahertz cross-correlation spectroscopy enables phase-sensitive measurements without the need for a laser source and, hence, presents a cost-efficient and versatile alternative to common terahertz time-domain spectroscopy approaches. This review article presents the development of this technique over the past two decades as well as applications of this approach. It is completed by a detailed mathematical description proving the irrelevance of the optical phases of the employed pump light modes. Numerical investigations of the resulting signal demonstrate the applicability and are compared to state-of-the-art measurements. Terahertz cross-correlation spectroscopy is a valuable alternative for moderate-demand applications already. Further possible improvements are discussed.
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