High-precision THz spectrum analyzer based on an unstabilized frequency comb

H. Fuser, R. Judaschke, M. Bieler
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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 9·10−14 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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基于非稳定频率梳的高精度太赫兹频谱分析仪
我们使用不稳定的频率梳作为传输振荡器,在太赫兹频谱区域进行高精度频率测量。为了校正太赫兹源和整流光梳的一条梳线产生的跳动信号对激光重复率波动的影响,采用了一种简单而灵活的算法。通过这种方法,我们实现了对100 GHz测试源的测量设置的精度高达9·10−14。与先前报道的使用飞秒激光在该频率范围内的精确测量相比,这是两个数量级的改进。
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