ALPS II 双激光外差探测系统
Two-Laser Heterodyne Detection System for ALPS II
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中文总结 AI 辅助
针对 ALPS II 外差探测系统中 LO 模外噪声问题，提出双激光方案，模型预测 SNR 提升约 35 倍，并经实验验证。
中文摘要 AI 辅助
任何轻粒子搜索 II（ALPS II）采用高度灵敏的外差探测系统，用于测量在再生腔（RC）内由轴子重新转换产生的超弱电磁场。外差系统的初始设计采用一个与 RC 共振的本地振荡器激光器（LO），与从腔中射出的弱信号场形成干涉拍频。该设计的一个弱点是，LO 的模外场分量可能大于模内分量，使其噪声主导噪声预算的光学部分，从而降低实验的信噪比（SNR）。此问题可通过引入第二个非共振激光器作为 LO 来解决。由于该激光器的模内光不与腔耦合，其反射功率显著高于共振 LO 的情况。我们提出了一个测量噪声模型，预测这些设计改动可将 SNR 提高约 35 倍。随后，通过向 RC 注入弱信号并检查每种配置下探测系统灵敏度的差异，实验证实了该模型。
英文摘要
The Any Light Particle Search II employs a highly sensitive heterodyne detection system to measure an ultra-weak electromagnetic field that is reconverted from axions inside a regeneration cavity (RC). The initial design of the heterodyne system utilized a local oscillator laser (LO) that was resonant with the RC to form an interference beatnote with the weak signal field exiting the cavity. A weakness of this design is that it is possible for the out-of-mode field component of the LO to be larger than the in-mode component, allowing its noise to dominate the optical component of the noise budget and reducing the SNR of the experiment. This problem can be addressed by introducing a second, non-resonant laser as the LO. Since the in-mode light of this laser does not couple to the cavity, significantly more of its power is reflected than when the LO is resonant. We present a model for the measurement noise that predicts these design changes increase the SNR by a factor of roughly 35. This model was then confirmed experimentally by injecting a weak signal to the RC and examining the difference in the sensitivity of the detection system in each of these configurations.
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)（马克斯·普朗克引力物理学研究所（阿尔伯特·爱因斯坦研究所））
- Leibniz Universität Hannover（汉诺威莱布尼茨大学）
- Department of Physics, University of Florida（佛罗里达大学物理系）
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