Demonstration of the Multimaterial Coating Concept to Reduce Thermal Noise in Gravitational-Wave Detectors

Physical Review Letters
S TaitI W Martin

Abstract

Thermal noise associated with the mechanical loss of current highly reflective mirror coatings is a critical limit to the sensitivity of gravitational-wave detectors. Several alternative coating materials show potential for reducing thermal noise, but cannot be used due to their high optical absorption. Multimaterial coatings have been proposed to enable the use of such materials to reduce thermal noise while minimizing their impact on the total absorption of the mirror coating. Here we present experimental verification of the multimaterial concept, by integrating aSi into a highly reflective SiO_{2} and Ta_{2}O_{5} multilayer coating. We show a significant thermal noise improvement and demonstrate consistent optical and mechanical performance. The multimaterial coating survives the heat treatment required to minimize the absorption of the aSi layers, with no adverse effects from the different thermomechanical properties of the three materials.

References

Mar 17, 2006·Applied Optics·Gregory M HarrySteven D Penn
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Feb 27, 2016·Physical Review Letters·B P AbbottUNKNOWN LIGO Scientific Collaboration and Virgo Collaboration
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Jul 2, 2016·Physical Review Letters·B P AbbottUNKNOWN LIGO Scientific Collaboration and Virgo Collaboration
Jun 18, 2017·Physical Review Letters·B P AbbottUNKNOWN LIGO Scientific and Virgo Collaboration
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Jul 14, 2018·Physical Review Letters·J SteinlechnerR Schnabel
Jul 13, 2019·Physical Review Letters·Kieran CraigIain W Martin

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