外差增强的腔模间距传感
Heterodyne-Enhanced Sensing of Cavity Mode Spacing
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中文总结 AI 辅助
提出外差增强传感方案，利用双激光拍频精确测量19米腔纵模间距，后处理降噪30倍并强抑校准信号。
中文摘要 AI 辅助
表征谐振模式的频率对多种实验应用至关重要。在本工作中，我们展示了一种外差增强的传感方案，能够精确测量19米光学腔纵模之间的频率间距。该技术利用两个谐振激光器，通过测量它们在注入腔之前和透射之后的干涉拍频，来感知它们在腔内传播过程中累积的差分相位。借助这些测量，我们能够在后处理中将控制回路中的噪声影响在1毫赫兹至100赫兹的频率范围内抑制多达30倍，同时将注入的校准信号抑制超过两个数量级。
英文摘要
Characterizing the frequencies of resonant modes is critical to a wide variety of experimental applications. In this work we demonstrate a heterodyne-enhanced sensing scheme capable of precisely measuring the frequency spacing between longitudinal modes of a 19 m optical cavity. The technique utilizes two resonant lasers to sense the differential phase accumulated between them as they propagate through the cavity by measuring their interference beatnote before their injection to the cavity and in transmission of it. With these measurements we were able to mitigate the effects of noise in our control loops in post-processing by up to a factor of 30 in the frequency range from 1 mHz to 100 Hz while suppressing injected calibration signals by over two orders of magnitude.
发表机构
- Deutsches Elektronen-Synchrotron DESY（德国电子同步加速器）
- Max-Planck-Institut für Gravitationsphysik (Albert-Einstein-Institut) and Leibniz Universität Hannover（马克斯·普朗克引力物理研究所（爱因斯坦研究所）和汉诺威莱布尼茨大学）
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