테라헤르츠 차동 시영역 분광
- 테라헤르츠 차동 시영역 분광
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- We report artifacts in THz differential time domain spectroscopy (THz DTDS). Demodulation process of lock-in amplifier (LIA) in THz DTDS is analyzed and it is found that low frequency noise arises from the digital sampling using optical delay line. We studied the characteristic of the low frequency noise and also analyzed demodulation factor, which is detection efficiency of the LIA. A quantitative model of demodulation factor is described and verified experimentally. The system sensitivity and accuracy have been improved by reducing the artifacts due to the low frequency noise and the demodulation factor.
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