We propose a method to control the thermal stability of a sapphire dielectric transducer made with two dielectric disks separated by a thin gap and resonating in the whispering gallery (WG) modes of the electromagnetic field. The simultaneous measurement of the frequencies of both a WGH mode and a WGE mode allows one to discriminate the frequency shifts due to gap variations from those due to temperature instability. A simple model, valid in quasi equilibrium conditions, describes the frequency shift of the two modes in terms of four tuning parameters. A procedure for the direct measurement of them is presented.
@article{arxiv.1001.0140,
title = {Thermal Control of a Dual Mode Parametric Sapphire Transducer},
author = {Jacopo Belfi and Nicolò Beverini and Andrea De Michele and Gianluca Gabbriellini and Francesco Mango and Roberto Passaquieti},
journal= {arXiv preprint arXiv:1001.0140},
year = {2010}
}
Comments
5 pages, 6 figures, presented at EFTF-IFCS joint conference 2009