论文标题
Terahertz时域光谱系统的电子期检测
Electronic Phase Detection with sub-10 fs Timing Jitter for Terahertz Time-Domain Spectroscopy Systems
论文作者
论文摘要
Terahertz的时间域光谱系统基于谐振器内部重复率调制（例如Slapcops [12]和Ecops [11]）依赖于电子相检测器，这些电子相检测器通常很容易表现出不可忽略的随机和系统性的TIMING误差。这大大限制了记录信息的质量。在这里，我们介绍了我们最近尝试减少自己电子相位检测系统中这些错误的结果。从59.0 fs降低到8.6 fs的六倍以上的计时射击导致可利用的Terahertz带宽和信噪比的大幅增加。此外，利用我们的干预延迟线作为校准标准，几乎可以完全消除系统误差，因此可以完成光谱吸收线的出色分辨率。这些改进提高了基于电子相检测的多层厚度测量值的准确性，超过五倍，将整体性能很好地推向了亚μm。
Terahertz time-domain spectroscopy systems based on resonator-internal repetition-rate modulation, such as SLAPCOPS [12] and ECOPS [11], rely on electronic phase detectors which are typically prone to exhibit both a non-negligible random and systematic timing error. This limits the quality of the recorded information significantly. Here, we present the results of our recent attempt to reduce these errors in our own electronic phase detection systems. A more than six-fold timing-jitter reduction from 59.0 fs to 8.6 fs led to a significant increase in both exploitable terahertz bandwidth and signal-to-noise ratio. Additionally, utilizing our interferometrically monitored delay line as a calibration standard, the systematic error could be removed almost entirely and thus, excellent resolution of spectral absorption lines be accomplished. These improvements increased the accuracy of our multi-layer thickness measurements based on electronic phase detection by more than a factor of five, pushing the overall performance well into the sub-μm regime.
