Advances in terahertz optical frequency comb operations have helped make possible single-mode THz emission in a wide spectral range at high powers.MANIJEH RAZEGHI, QUANYONG LU, SANTANU MANNA, DONGHAI WU AND STEVEN SLIVKEN, NORTHWESTERN UNIVERSITYThe terahertz (THz) electromagnetic spectrum (1 to 10 THz), sitting between the infrared wavelengths on the higher frequency side and microwaves on the lower frequency side, has unique and important properties. THz waves can pass through a number of materials, including synthetics, textiles, paper and cardboard. Many biomolecules, proteins, explosives or narcotics feature characteristic absorption lines — so-called spectral “fingerprints” — at frequencies between 1 and 10 THz. 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