2. Terahertz sources
The performance of far-infrared spectrometry techniques ("terahertz spectrometers") is intimately linked to the methods used to generate this submillimeter radiation. Here, we briefly describe these methods and highlight the parameters and characteristics relevant to spectroscopy.
2.1 Non-optical terahertz sources
Because of its position in the electromagnetic spectrum, THz radiation is, from a technological point of view, at the frontier or, more precisely, at the confluence of the fields of electronics and optics.
In fact, on the "low THz frequency" side, we have at our disposal all the heritage and continuing innovation of microwave and submillimeter technologies. Although the first sources of coherent radiation were microwave tubes...
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Terahertz sources
Equilibrium spectroscopy
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