Mechanical loss and stability analysis of NEXCERA in ultra-stable optical cavities

Abstract

NEXCERA has emerged as a ceramic-based material for spacers in ultra-stable optical cavities, with a coefficient of thermal expansion that crosses zero near room temperature. In such cavities, frequency stability is ultimately limited by Brownian thermal noise in the cavity components. A key parameter in this context is the mechanical loss, which has remained unknown for NEXCERA. In this work, we investigate the mechanical loss of NEXCERA N117B at room temperature for various resonances using the gentle nodal suspension technique. We measure a promising minimum mechanical loss of $\varphi =1.89\times 10^{-5}$, indicating the suitability of NEXCERA for low-noise optical cavities. Using this value, we calculate the thermal noise of a cavity with a NEXCERA spacer and compare its performance to established materials such as ULE and Zerodur, taking into account different mirror substrate options. Our analysis shows that NEXCERA is a strong candidate for ultra-stable cavities due to its low thermal noise. Combined with its previously reported low linear drift, it offers a highly attractive option for long-term stable optical frequency references.

13 pages, 7 figures

References in corpus (18)

• Scientific Objectives of Einstein Telescope
• Sub-Hz line width diode lasers by stabilization to vibrationally and thermally compensated ULE Fabry-Perot cavities
• Precision Metrology Meets Cosmology: Improved Constraints on Ultralight Dark Matter from Atom-Cavity Frequency Comparisons
• Titania-doped tantala/silica coatings for gravitational-wave detection
• Tuning the Thermal Expansion Properties of Optical Reference Cavities with Fused Silica Mirrors
• An ultrastable silicon cavity in a continuously operating closed-cycle cryostat at 4 K
• The Science of the Einstein Telescope
• Cryogenic sapphire oscillator with exceptionally high long-term frequency stability
• Low mechanical loss TiO${}_2$:GeO${}_2$ coatings for reduced thermal noise in Gravitational Wave Interferometers
• Measurements of a low temperature mechanical dissipation peak in a single layer of Ta2O5 doped with TiO2
• Resonator with ultra-high length stability as a probe for Equivalence-Principle-violating physics
• Thermoelastic relaxation in elastic structures with applications to thin plates
• Thermal noise and mechanical loss of SiO${}_2$/Ta${}_2$O${}_5$ optical coatings at cryogenic temperatures
• On the mechanical quality factors of cryogenic test masses from fused silica and crystalline quartz
• Broadband Measurement of Coating Thermal Noise in Rigid Fabry-Perot Cavities
• A simplified cryogenic optical resonator apparatus providing ultra-low frequency drift
• Potential mechanical loss mechanisms in bulk materials for future gravitational wave detectors
• Optical ultra-stable optical clock cavities as resonant mass gravitational wave detectors in search for new physics

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