posted on 2023-11-30, 17:28authored byZachary R. Bush, Simon Barke, Harold Hollis, Aaron D. Spector, Ayman Hallal, Giuseppe Messineo, D. B. Tanner, Guido Mueller
We explore the application of heterodyne interferometry for a weak-field coherent detection scheme. The methods detailed here will be used in ALPS II, an experiment designed to search for weakly-interacting, sub-eV particles. For ALPS II to reach its design sensitivity this detection system must be capable of accurately measuring fields with equivalent amplitudes on the order of 10$^{-5}$ photons per second or greater. We present initial results of an equivalent dark count rate on the order of $10^{-5}$ photons per second as well as successful generation and detection of a signal with a field strength equivalent to $10^{-2}$ photons per second.
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