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Widely tunable compact terahertz gas lasers

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Science  15 Nov 2019:
Vol. 366, Issue 6467, pp. 856-860
DOI: 10.1126/science.aay8683

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Filling the terahertz gap

Compared with other wavelengths, coherent sources of electromagnetic radiation in the terahertz regime are relatively scarce. Despite a number of applications in security imaging, spectroscopy, and chemical analysis, it has been experimentally challenging to produce such light. Chevalier et al. demonstrate an approach involving the excitation of a molecular gas with a quantum cascade laser. They show that they can tune into a broad range of desired wavelengths by carefully selecting the required molecular transition. A compact platform—the size of a shoe box—and widely tunable source of coherent terahertz radiation should find immediate application across a number of fields.

Science, this issue p. 856

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