Abstract
We perform high-precision frequency measurements in the THz spectral region using an unstabilized frequency comb, which acts as a transfer oscillator. To correct the beating signal resulting from the THz source and one comb line of the rectified optical comb for fluctuations of the laser repetition rate, a simple and flexible algorithm is used. By this, we achieve an accuracy of the measurement setup as high as 9·10 <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">-14</sup> for a 100 GHz test source. This is an improvement of two orders of magnitude compared to previously reported precision measurements in this frequency range employing femtosecond lasers.
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