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Optical ac coupling to overcome limitations in the detection of optical power fluctuations

机译:光学交流耦合克服了光功率波动检测中的限制

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摘要

A high-sensitivity detection method for optical power fluctuations is demonstrated based on photodetection in reflection of an optical resonator with a specific impedance matching. That resonator is used to reduce the carrier power reflected by the resonator while preserving the power fluctuation sidebands for frequencies above the resonator bandwidth. A sensitivity of 7 X 10~(-10) Hz~(-1/2) for relative power fluctuations was achieved with only 3 mA of detected photocurrent and 99.6percent of the power remained for downstream experiments. As in the widely used ac coupling of electrical signals, this technique overcomes dynamic-range limits and reduces detector noise associated with large carrier amplitudes of the optical field.
机译:基于具有特定阻抗匹配的光谐振器的反射中的光检测,说明了用于光功率波动的高灵敏度检测方法。该谐振器用于减少谐振器反射的载波功率,同时为谐振器带宽以上的频率保留功率波动边带。相对功率波动的灵敏度为7 X 10〜(-10)Hz〜(-1/2),仅检测到3 mA的光电流,而下游实验仍保留了99.6%的功率。如同在广泛使用的电信号交流耦合中一样,该技术克服了动态范围限制,并降低了与光场的大载波幅度相关的检测器噪声。

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