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Structural characterization of thin non-crystalline layers for low thermal noise optic

Abstract : Predicted in 1916 by Einstein, then detected one hundred year later by the VIRGO and LIGO collaborations, the gravitational waves are a promising tool to observe the universe at scales always bigger. However, to detect a larger number of events, one of the main limitation of the detectors originates in the mirrors coatings thermal noise, thin non-crystalline layers composed of SiO2 and TiO2-doped Ta2O5. The aim of this work is to study the micro-structural origin of the layers thermal noise, by using vibrational spectroscopies, in order to, ultimately, process more efficient materials. Studies show a decrease of the thermal noise when the mirrors are annealed at low temperature. In silica, a structural reorganization happens during the annealing, following the evolution of the thermal noise. Notably, a stress relaxation has been observed. However, in Ta2O5, oxide with a complex structure not much studied, the impact of the annealing seems to be more limited, while the structure crystallizes easily as soon as the temperature increases. To complete our knowledge of this structure, in-situ high pressure measurements were conducted. Finally, the TiO2-doping effect of the Ta2O5 structures was studied
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Submitted on : Monday, October 30, 2017 - 8:12:36 PM
Last modification on : Thursday, October 15, 2020 - 8:54:03 AM
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  • HAL Id : tel-01626513, version 1



Élodie Coillet. Structural characterization of thin non-crystalline layers for low thermal noise optic. Optics [physics.optics]. Université de Lyon, 2017. English. ⟨NNT : 2017LYSE1132⟩. ⟨tel-01626513⟩



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