Affiliation:
1. Physikalisch-Technische Bundesanstalt
2. University of Glasgow
Abstract
State-of-the-art optical oscillators employing cryogenic reference
cavities are limited in performance by the Brownian thermal noise
associated with the mechanical dissipation of the mirror coatings.
Recently, crystalline Al1−xGa
x
As/GaAs coatings have emerged as a promising
candidate for improved coating thermal noise. We present measurements
of the frequency noise of two fully crystalline cryogenic reference
cavities with Al0.92Ga0.08As/GaAs optical coatings. We report on
birefringent noise associated with anticorrelated frequency
fluctuations between the polarization modes of the crystalline
coatings and identify variables that affect its magnitude. Comparing
the birefringent noise between the two cryogenic reference cavities
reveals a phenomenological set of scalings with intracavity power and
mode area. We implement an interrogation scheme that cancels this
noise by simultaneous probing of both polarization modes. The residual
noise remaining after this cancellation is larger than both cavities’
thermal noise limits but still lower than the instabilities previously
measured on equivalent resonators with dielectric coatings. Though the
source of these noise mechanisms is unclear, we demonstrate that
crystalline coatings can provide stability and sensitivity competitive
with resonators employing dielectric coatings.
Funder
National Institute of Standards and
Technology
Defense Advanced Research Projects
Agency
Air Force Research
Laboratory
National Science Foundation
European Metrology Programme for
Innovation and Research
Deutsche
Forschungsgemeinschaft
Subject
Atomic and Molecular Physics, and Optics,Electronic, Optical and Magnetic Materials
Cited by
17 articles.
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