Mechanical loss in state-of-the-art amorphous optical coatings

Abstract

We present the results of mechanical characterizations of many different high-quality optical coatings made of ion-beam-sputtered titania-doped tantala and silica, developed originally for interferometric gravitational-wave detectors. Our data show that in multi-layer stacks (like high-reflection Bragg mirrors, for example) the measured coating dissipation is systematically higher than the expectation and is correlated with the stress condition in the sample. This has a particular relevance for the noise budget of current advanced gravitational-wave interferometers, and, more generally, for any experiment involving thermal-noise limited optical cavities.

31 pages, 14 figures

References in corpus (8)

• Advanced Virgo: a 2nd generation interferometric gravitational wave detector
• Advanced LIGO
• Cavity Optomechanics
• Titania-doped tantala/silica coatings for gravitational-wave detection
• Measurements of mechanical thermal noise and energy dissipation in optical dielectric coatings
• Optimal Light Beams and Mirror Shapes for Future LIGO Interferometers
• Material loss angles from direct measurements of broadband thermal noise
• Investigation of the Young's modulus and thermal expansion of amorphous titania-doped tantala films

Cited by in corpus (30)

• Observation of Gravitational Waves from a Binary Black Hole Merger
• GW170814: A Three-Detector Observation of Gravitational Waves from a Binary Black Hole Coalescence
• GW150914: The Advanced LIGO Detectors in the Era of First Discoveries
• Open data from the first and second observing runs of Advanced LIGO and Advanced Virgo
• A Cryogenic Silicon Interferometer for Gravitational-wave Detection
• Amorphous optical coatings of present gravitational-wave interferometers
• Concept study and preliminary design of a cold atom interferometer for space gravity gradiometry
• Low mechanical loss TiO${}_2$:GeO${}_2$ coatings for reduced thermal noise in Gravitational Wave Interferometers
• Progress in the measurement and reduction of thermal noise in optical coatings for gravitational-wave detectors
• Observation of a Correlation Between Internal friction and Urbach Energy in Amorphous Oxides Thin Films
• Structure and morphology of low mechanical loss TiO${}_2$-doped Ta${}_2$O${}_5$
• High-Reflection Coatings for Gravitational-Wave Detectors: State of The Art and Future Developments
• Audio-band Coating Thermal Noise Measurement for Advanced LIGO with a Multi-mode Optical Resonator
• Comprehensive study of amorphous metal oxide and Ta${}_2$O${}_5$-based mixed oxide coatings for gravitational-wave detectors
• Correlated evolution of structure and mechanical loss of a sputtered silica film
• Optical and mechanical properties of ion-beam-sputtered Nb${}_2$O${}_5$ and TiO${}_2$-Nb${}_2$O${}_5$ thin films for gravitational-wave interferometers
• Exploration of co-sputtered Ta${}_2$O${}_5$-ZrO${}_2$ thin films for gravitational-wave detectors
• ETpathfinder: a cryogenic testbed for interferometric gravitational-wave detectors
• Brownian Thermal Noise in Functional Optical Surfaces
• Highly reflective low-noise etalon-based meta-mirror
• Prediction of crystallized phases of amorphous Ta${}_2$O${}_5$-based mixed oxide thin films using density functional theory calculations
• Optical and mechanical properties of ion-beam-sputtered MgF${}_2$ thin films for gravitational-wave interferometers
• A method for the experimental measurement of bulk and shear loss angles in amorphous thin films
• Effects of mixing and annealing on the optical and mechanical properties of TiO${}_2$:Ta${}_2$O${}_5$ amorphous coatings
• Intrinsic dissipation mechanisms in metallic glass resonators
• Development of ion-beam sputtered silicon nitride thin films for low-noise mirror coatings of gravitational-wave detectors
• Determination of compressive stress in thin films using micro-machined buckled membranes
• Characterization of ion-beam-sputtered AlF${}_3$ thin films for gravitational-wave interferometers
• A Systematic Error in the Internal Friction Measurement of Coatings for Gravitational Waves Detectors
• Thermal Noise Reduction in Ternary Optical Coatings: From Ti::GeO${}_2$-Based Ternary Systems to High Index Materials