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Coherent multiwave heterodyne frequency measurement of a far-infared laser by means of a femtosecond laser comb

N. Beverini, G. Carelli, A. De Michele, E. Maccioni, B. Nyushkov, F. Sorrentino, and A. Moretti

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Abstract

We demonstrate the possibility of using a femtosecond laser to measure with high accuracy the frequency of a far-infrared (FIR) monochromatic source, such as an optically pumped molecular laser, by generating in a suitable mixer a signal in the radio-frequency region at the frequency difference between n steps of a femtosecond comb and the FIR source. All the couples of modes lying a distance of n steps from one another contribute coherently to the heterodyne signal. The technique has been tested up to 670 GHz.

© 2005 Optical Society of America

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