A second generation of low thermal noise cryogenic silicon resonators

8th Symposium on Frequency Standards and Metrology 2015

Matei, D.G.^1 ; Legero, T.^1 ; Grebing, Ch.^1 ; Häfner, S.^1 ; Lisdat, Ch.^1 ; Weyrich, R.^1 ; Zhang, W.^2 ; Sonderhouse, L.^2 ; Robinson, J.M.^2 ; Riehle, F.^1 ; Ye, J.^2 ; Sterr, U.^1

Physikalisch-Technische Bundesanstalt (PTB), Bundesallee 100, Braunschweig

38116, Germany^1

JILA, National Institute of Standards and Technology, University of Colorado, 440 UCB, Boulder

CO

80309-0440, United States^2

关键词: Anisotropic elasticity;    Low thermal conductivity;    Second generation;    Silicon resonators;    Single crystal silicon;    Stabilized lasers;    Thermal shields;    Vertical accelerations;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/723/1/012031/pdf
DOI  :  10.1088/1742-6596/723/1/012031

来源: IOP

【 摘 要 】

We have set up an improved vertically mounted silicon cavity operating at the zero-crossing temperature of the coefficient of thermal expansion (CTE) near 123 K with estimated thermal noise limited instability of 4 x 10-17in the modified Allan deviation. Owing to the anisotropic elasticity of single-crystal silicon, the vertical acceleration sensitivity was minimized in situ by axially rotating the resonator with respect to the mounting frame. The control of the resonator temperature is greatly improved by using a combination of two thermal shields, monitoring with several temperature sensors, and employing low-thermal conductivity materials. The instability of the resonator stabilized laser was characterized by comparing with another low-noise system based on a 48 cm long room temperature cavity of PTB's strontium lattice clock, resulting in a modified Allan deviation of 7 x 10-17at 100 s.