Audio-band Coating Thermal Noise Measurement for Advanced LIGO with a Multi-mode Optical Resonator

Abstract

In modern high precision optical instruments, such as in gravitational wave detectors or frequency references, thermally induced fluctuations in the reflective coatings can be a limiting noise source. This noise, known as coating thermal noise, can be reduced by choosing materials with low mechanical loss. Examination of new materials becomes a necessity in order to further minimize the coating thermal noise and thus improve sensitivity of next generation instruments. We present a novel approach to directly measure coating thermal noise using a high finesse folded cavity in which multiple Hermite-Gaussian modes co-resonate. This method is used to probe surface fluctuations on the order 10^-17 m\rtHz in the frequency range 30-400 Hz. We applied this technique to measure thermal noise and loss angle of the coating used in Advanced LIGO.

References in corpus (19)

• Observation of Gravitational Waves from a Binary Black Hole Merger
• Advanced LIGO
• The Sensitivity of the Advanced LIGO Detectors at the Beginning of Gravitational Wave Astronomy
• Internal thermal noise in the LIGO test masses : a direct approach
• Mechanical systems in the quantum regime
• Compact, thermal-noise-limited optical cavity for diode laser stabilization at 1 x 10-15
• Thermal noise in interferometric gravitational wave detectors due to dielectric optical coatings
• Thermodynamical fluctuations and photo-thermal shot noise in gravitational wave antennae
• Titania-doped tantala/silica coatings for gravitational-wave detection
• Thermoelastic Noise and Homogeneous Thermal Noise in Finite Sized Gravitational-Wave Test Masses
• Thermo-optic noise in coated mirrors for high-precision optical measurements
• Mechanical loss in state-of-the-art amorphous optical coatings
• Brownian Thermal Noise in Multilayer Coated Mirrors
• Multi-Material Coatings with Reduced Thermal Noise
• Direct Observation of Broadband Coating Thermal Noise in a Suspended Interferometer
• Material loss angles from direct measurements of broadband thermal noise
• Coating thermal noise of a finite-size cylindrical mirror
• Calculation of thermal noise in grating reflectors
• Broadband Measurement of Coating Thermal Noise in Rigid Fabry-Perot Cavities

Cited by in corpus (19)

• Exploring the sensitivity of gravitational wave detectors to neutron star physics
• Review of the Advanced LIGO gravitational wave observatories leading to observing run four
• Prospects for detecting gravitational waves at 5 Hz with ground-based detectors
• Progress in the measurement and reduction of thermal noise in optical coatings for gravitational-wave detectors
• Direct Measurement of Coating Thermal Noise in Optical Resonators
• Structure and morphology of low mechanical loss TiO${}_2$-doped Ta${}_2$O${}_5$
• Quantum-enhanced interferometry for axion searches
• Excess noise and photo-induced effects in highly reflective crystalline mirror coatings
• 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
• Mechanical Ringdown Studies of Large-Area Substrate-Transferred GaAs/AlGaAs Crystalline Coatings
• Quantum correlation measurements in interferometric gravitational wave detectors
• Particle swarm optimization of the sensitivity of a cryogenic gravitational wave detector
• Brownian Thermal Noise in Functional Optical Surfaces
• A six degree-of-freedom fused silica seismometer: Design and tests of a metal prototype
• Towards observing the neutron star collapse with gravitational wave detectors
• Numerically modeling Brownian thermal noise in amorphous and crystalline thin coatings
• Development of ion-beam sputtered silicon nitride thin films for low-noise mirror coatings of gravitational-wave detectors
• Thermorefringent noise in crystalline optical materials
• Cryogenic optical shadow sensors for future gravitational wave detectors