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Coating thermal noise is a fundamental limit for precision experiments basedon optical and quantum transducers. In this review, after a brief overview ofthe techniques for coating thermal noise measurements, we present the latestworld-wide research activity on low-noise coatings, with a focus on the resultsobtained at the Laboratoire des Mat\'{e}riaux Avanc\'{e}s. We report newupdated values for the Ta$_2$O$_5$, Ta$_2$O$_5$-TiO$_2$ and SiO$_2$ coatings ofthe Advanced LIGO, Advanced Virgo and KAGRA detectors, and new results fromsputtered Nb$_2$O$_5$, TiO$_2$-Nb$_2$O$_5$, Ta$_2$O$_5$-ZrO$_2$, MgF$_2$,AlF$_3$ and silicon nitride coatings. Amorphous silicon, crystalline coatings,high-temperature deposition, multi-material coatings and composite layers arealso briefly discussed, together with the latest developments of structuralanalyses and models.

Progress in the measurement and reduction of thermal noise in optical coatings for gravitational-wave detectors