Audio-band Coating Thermal Noise Measurement for Advanced LIGO with a Multi-mode Optical Resonator
arXiv:1609.05595 · doi:10.1103/PhysRevD.95.022001
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 (8)
- Advanced LIGO
- Compact, thermal-noise-limited optical cavity for diode laser stabilization at 1 x 10-15
- Titania-doped tantala/silica coatings for gravitational-wave detection
- Thermo-optic noise in coated mirrors for high-precision optical measurements
- Multi-Material Coatings with Reduced Thermal Noise
- Material loss angles from direct measurements of broadband thermal noise
- Coating thermal noise of a finite-size cylindrical mirror
- Broadband Measurement of Coating Thermal Noise in Rigid Fabry-Perot Cavities
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- 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
- Development of ion-beam sputtered silicon nitride thin films for low-noise mirror coatings of gravitational-wave detectors
- Numerically modeling Brownian thermal noise in amorphous and crystalline thin coatings
- Thermorefringent noise in crystalline optical materials
- Cryogenic optical shadow sensors for future gravitational wave detectors