使用射频光学解调的差分波前传感和控制
Differential wavefront sensing and control using radio-frequency optical demodulation
摘要：
差分波前传感是优化许多精密干涉实验性能的一项重要技术。也许最广泛的应用是使用象限光电二极管测量的射频搏动进行对准感测。在这里，我们提出了一种新的技术，使用光学解调测量这种光学拍在显着更高的分辨率，使用商业实验室设备。我们的实验表明，捕获的图像可以进行数字处理，以产生波前误差信号，并使用这些在一个闭环控制系统，用于校正波前误差的对准和模式匹配的光束进入光学腔，以99.9%。该实验为当与高阶波前致动器配对时甚至高阶误差的校正铺平了道路。这种感测方案可以用于优化由耦合腔组成的复杂干涉仪，例如在引力波检测器中发现的那些，或者仅仅用于在外差干涉仪桌面实验中感测高阶波前误差。
英文摘要：
Differential wavefront sensing is an essential technique for optimising the performance of many precision interferometric experiments. Perhaps the most extensive application of this is for alignment sensing using radio-frequency beats measured with quadrant photodiodes. Here we present a new technique that uses optical demodulation to measure such optical beats at significantly higher resolutions using commercial laboratory equipment. We experimentally demonstrate that the images captured can be digitally processed to generate wavefront error signals and use these in a closed loop control system for correct wavefront errors for alignment and mode-matching a beam into an optical cavity to 99.9\%. This experiment paves the way for the correction of even higher order errors when paired with higher order wavefront actuators. Such a sensing scheme could find use in optimizing complex interferometers consisting of coupled cavities, such as those found in gravitational wave detectors, or simply just for sensing higher order wavefront errors in heterodyne interferometric table-top experiments.
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