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Increasing requirements in the sensitivity of interferometric measurements isa common feature of several research fields, from gravitational wave detectionto quantum optics. This motivates refined studies of high reflectivity mirrorsand of noise sources that are tightly related to their structure. In this workwe present an experimental characterization of photothermal andthermo-refractive effects in high reflectivity mirrors, i.e., of the variationsin the position of their effective reflection plane due to weak residual powerabsorption. The measurements are performed by modulating the impinging power inthe range 10 Hz $\div$ 100 kHz. The experimental results are compared with anexpressly derived theoretical model in order to fully understand the phenomenaand exploit them to extract useful effective thermo-mechanical parameters ofthe coating. The measurements are extended at cryogenic temperature, where mosthigh sensitivity experiments are performed (or planned in future versions) andwhere characterizations of dielectric film coatings are still poor.

Photothermal and thermo-refractive effects in high reflectivity mirrors at room and cryogenic temperature