NEXCERA is a machinable and highly polishable ceramic with attractive properties for use in precision instruments, in particular because its coefficient of thermal expansion exhibits a zero crossing at room temperature. We performed an accurate measurement of the long-term drift of the length of a 12~cm long NEXCERA block by using it as a spacer of a high-finesse optical cavity. At room temperature, we found a fractional length drift rate L−1dΔL/dt=−1.74×10−8yr−1.
@article{arxiv.1805.08073,
title = {Characterization of the long-term dimensional stability of a NEXCERA block using the optical resonator technique},
author = {Chang Jian Kwong and Michael Georg Hansen and Jun Sugawara and Stephan Schiller},
journal= {arXiv preprint arXiv:1805.08073},
year = {2018}
}