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Widely tunable quantum cascade laser-based terahertz source

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Abstract

A compact, tunable, ultranarrowband terahertz source, Δν1MHz, is demonstrated by upconversion of a 2.324 THz, free-running quantum cascade laser with a THz Schottky-diode-balanced mixer using a swept, synthesized microwave source to drive the nonlinearity. Continuously tunable radiation of 1 μW power is demonstrated in two frequency regions: νLaser±0 to 50 GHz and νLaser±70 to 115 GHz. The sideband spectra were characterized with a Fourier-transform spectrometer, and the radiation was tuned through CO, HDO, and D2O rotational transitions.

© 2014 Optical Society of America

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