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 Φ = 1.89x10
-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.
Details
- External Organisation(s)
-
Laboratory for Emerging Nanometrology Braunschweig (LENA)
Nicolaus Copernicus University
- Type
- Article
- Journal
- Journal of the Optical Society of America B: Optical Physics
- Volume
- 42
- Pages
- 2488-2495
- No. of pages
- 8
- ISSN
- 0740-3224
- Publication date
- 14.10.2025
- Publication status
- Published
- Peer reviewed
- Yes
- ASJC Scopus subject areas
- Statistical and Nonlinear Physics, Atomic and Molecular Physics, and Optics
- Electronic version(s)
-
https://doi.org/10.1364/JOSAB.578004 (Access:
Unknown
)
