Reducing thermal noise from optical coatings is crucial to reaching the required sensitivity in next generation interferometric gravitational-wave detectors. Here we show that adding TiO2 to Ta2O5 in Ta2O5 / SiO2 coatings reduces the internal friction and in addition present data confirming it reduces thermal noise. We also show that TiO2 -doped Ta2 O5 /SiO2 coatings are close to satisfying the optical absorption requirements of second generation gravitational-wave detectors.
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Harry CQG2006 | 261.45 KB |