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On the accuracy of decay constant measurement by swept-cavity heterodyne cavity ringdown spectroscopy

机译：扫空外差腔衰荡光谱测量衰减常数的准确性

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摘要

Cavity ringdown spectroscopy (CRDS) measures the decay time, of a resonant optical cavity containing a measurand, as a function of optical frequency. The measurand is identified and quantified by the cavity decay time, which is modified by the measurand within. As coupling light into a high-finesse optical cavity is difficult, the throughput of the cavity is small. A recent variant, swept-cavity heterodyne CRDS, interferes backward escaping cavity light, with light reflected from the cavity input mirror, providing better signal sensitivity due to the heterodyne advantage. The measured interference signal is demodulated and log-amplified to produce a signal whose slope is representative of the cavity decay time. This paper, for the first time, examines the conditions required for high-fidelity measurements of the cavity decay time using swept-cavity heterodyne CRDS and log-amplification technique. We demonstrate that, due to the very large bandwidth and dynamic range of the log-amplifier, for realistic measurement conditions, the log-amplifier does not impose any significant restrictions on the measurement accuracy. We also demonstrate, however, the measurement accuracy is limited by two factors, the detector bandwidth, and segment of acquired data used to measure the slope.
机译：腔衰荡光谱法（CRDS）测量包含被测物的谐振光学腔的衰减时间，该衰减时间是光频率的函数。被测物通过腔衰变时间来识别和量化，该衰变时间由内部的被测物修改。由于难以将光耦合到高精细的光学腔中，因此腔的通量很小。最近的一个变种，扫腔外差CRDS干扰了从腔体输入镜反射的光，并向后逸出腔腔光，这归因于外差腔优势，从而提供了更好的信号灵敏度。对测得的干扰信号进行解调和对数放大，以产生其斜率代表腔衰变时间的信号。本文首次探讨了使用扫掠腔外差CRDS和对数放大技术对腔衰变时间进行高保真测量所需的条件。我们证明，由于对数放大器的带宽和动态范围非常大，对于实际的测量条件，对数放大器不会对测量精度施加任何重大限制。但是，我们也证明了测量精度受到两个因素的限制，检测器带宽和用于测量斜率的采集数据段。

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