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Stable and spectrally narrow laser sources referenced to ultrastable passive Fabry-Pérot cavities are invaluable for optical atomic clocks and they find important applications, e.g. in precision tests of relativity or novel radar applications. Ultimately the fractional frequency instability of the laser is limited by Brownian thermal noise of the cavity constituents.
Thermal noise fundamentally limits the frequency stability of optical resonators used in optical clocks or to generate ultrapure microwaves by optical frequency division. We will give an overview of the relevant noise mechanisms, their calculation and discuss different current developments to reduce the noise. In one approach a cryogenic silicon resonator with very low thermal noise operated at a...
Thermal phase noise in optical interferometry can be compensated by exploiting coherence for underlying stochastic displacements and strains. The phase upon reflection from a fluctuating mirror's surface can thereby have reduced sensitivity to thermal noise.
We measure the frequency fluctuations induced by thermal noise driven length fluctuations in a variety of rigid Fabry-Perot cavities. The results are in basic agreement with theoretical predictions [1].
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