Coherent Detection of Ultra-weak Electromagnetic Fields

Abstract

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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Cited by in corpus (6)

• Experimental demonstration of a thermal-EM concentrator for enhancing EM signals and converging heat fluxes simultaneously
• The Any Light Particle Search experiment at DESY
• Speeding axion haloscope experiments using heterodyne-variance-based detection with a power-meter
• Towards the first axion search results of the Any Light Particle Search II experiment
• ALPSII Status Report
• Precision optomechanics for geometrically modematched Fabry-Perot cavities in ALPS II