光机械系统的外差位置检测
Heterodyne position detection of an optomechanical system
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中文总结 AI 辅助
研究光机械系统位置读出，提出基于数字同相和正交解调的外差检测方案，相比标准零差法有稳健、消除相位缠绕失真、校准因子不受光功率漂移影响的优势，通过实验证明并量化了这些优势，可用于基于相位读出的光机械系统。
中文摘要 AI 辅助
我们报告了一种用于光机械系统（特别是光悬浮粒子）位置读出的外差检测方案，该方案通过现场可编程门阵列上的数字同相和正交解调来实现。与标准零差方法相比，该方法具有三个关键优势：在存在强寄生背向反射场时仍保持稳健，否则会妨碍稳定锁相；产生与粒子位移成线性比例的信号，消除相位缠绕失真；其校准因子本质上不受本地振荡器或散射场光功率漂移的影响。我们通过对同一捕获粒子同时进行零差和外差测量，实验证明并量化了这三个优势。该方法可用于任何基于相位读出的光机械系统。
英文摘要
We report a heterodyne detection scheme for position readout of an optomechanical system, in particular an optically levitated particle, implemented via digital In-phase and Quadrature demodulation on a field-programmable gate array. Compared to the standard homodyne approach, the proposed method offers three key advantages: it remains robust in the presence of strong parasitic back-reflected fields that would otherwise prevent stable phase locking; it produces a signal linearly proportional to the particle displacement, eliminating phase-wrapping distortion; and its calibration factor is intrinsically immune to drifts in the optical power of the local oscillator or scattered field. We experimentally demonstrate and quantify all three advantages through simultaneous homodyne and heterodyne measurements on the same trapped particle. The proposed method can be used in any optomechanical system based on phase readout.
