This chapter discusses the terahertz-related experimental technique, including high-power laser sources, detectors of intense radiation, and optical components such as windows and filters, as well as experimental methods suitable for terahertz investigations. The treatment of sources of high-power terahertz radiation include the CO2 laser, optically pumped terahertz molecular lasers, terahertz molecular lasers pumped by tunable high-pressure TE-CO2 laser, free-electron lasers, and generation of short coherent terahertz pulses is covered. Optical components and methods in the THz range comprising windows, filters, polarizers, attenuators, and methods of spectral analysis are also mentioned. In particular, the spectral characteristics of a large number of materials are presented. Various detection concepts are described in detail.
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