室温和低温下高反射率镜的光热和热折射效应
Photothermal and thermo-refractive effects in high reflectivity mirrors at room and cryogenic temperature
摘要：
从引力波探测到量子光学，对干涉测量灵敏度的要求越来越高，这是几个研究领域的共同特征。这激发了对高反射率反射镜和与其结构密切相关的噪声源的精细研究。在这项工作中，我们提出了一个实验表征的光热和热折射效应的高反射率镜，即，由于弱的剩余功率吸收，它们的有效反射平面的位置的变化。通过在10 Hz $÷$ 100 kHz范围内调制冲击功率来进行测量。实验结果进行了比较，明确推导出的理论模型，以充分理解的现象，并利用它们来提取有用的有效的涂层的热机械参数。测量在低温下进行，其中大多数高灵敏度实验进行（或计划在未来的版本）和介电膜涂层的表征仍然很差。
英文摘要：
Increasing requirements in the sensitivity of interferometric measurements is a common feature of several research fields, from gravitational wave detection to quantum optics. This motivates refined studies of high reflectivity mirrors and of noise sources that are tightly related to their structure. In this work we present an experimental characterization of photothermal and thermo-refractive effects in high reflectivity mirrors, i.e., of the variations in the position of their effective reflection plane due to weak residual power absorption. The measurements are performed by modulating the impinging power in the range 10 Hz $÷$ 100 kHz. The experimental results are compared with an expressly derived theoretical model in order to fully understand the phenomena and exploit them to extract useful effective thermo-mechanical parameters of the coating. The measurements are extended at cryogenic temperature, where most high sensitivity experiments are performed (or planned in future versions) and where characterizations of dielectric film coatings are still poor.
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