Frederik Walla, Borja Jerez, Pedro Martín-Mateos, Cristina de Dios, Pablo Acedo,
http://ieeexplore.ieee.org/document/8067218/
An absolute-frequency Terahertz dual frequency comb spectrometer for tunable, high-resolution and real-time rapid acquisition is presented. Two combs (probe and local oscillator) are electro-optically generated from the same line of a master optical frequency comb selected by optical injection locking. Photomixing each of these two initial optical combs with a coherent mode from the same master comb generates a narrow-linewidth Terahertz dual comb through difference frequency generation. The resulting dual-comb teeth are absolutely referenced to a RF clock standard.
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