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Focused light in the Terahertz regime consisting of a broad spectrum of wavelengths

Creating Terahertz radiation isn't easy, but it is extremely useful. It can, for example, be used for building chemical sensors to detect certain substances. For this purpose, however, the Terahertz light has to fulfil two important requirements: The light beam must be well focused, and in contrast to normal laser light, which has just one wavelength, it must have a broad spectrum of wavelengths.
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