Thermal noise in optical cavities revisited
Thermal noise in optical cavities revisited
Thermal noise of optical reference cavities sets a fundamental limit to the frequency instability of ultrastable lasers. Using Levin's formulation of the fluctuation-dissipation theorem, we correct the analytical estimate for the spacer contribution given by Numata et al. [Phys. Rev. Lett.93, 250602 (2004)]. For detailed analysis, finite-element calculations of the …