Bonn 2020 – scientific programme

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T: Fachverband Teilchenphysik

T 77: Axion like particles II

T 77.3: Talk

Thursday, April 2, 2020, 17:05–17:20, H-HS XV

Heterodyne Detection in ALPS II — •Todd Kozlowski for the ALPS collaboration — University of Florida

The Any Light Particle Search II (ALPS II) is a laboratory-based "light-shining-through-a-wall" experiment which aims to detect axion-like particles. This technique requires a detector that is sensitive to signals as weak as a single photon per 10 hours. One of two detection methods to be implemented in ALPS II uses heterodyne interferometry, whereby a strong local oscillator laser is overlapped with the weak signal field to generate a radio frequency optical beat note. Extremely weak signals can be resolved over sufficient time, thanks to the coherence between the signal and local oscillator fields. This coherence is maintained by a series of phase-locked-loops and a stable central optical breadboard, which minimizes relative phase noise between these fields. This talk will provide an overview of the heterodyne interferometry coherent detection technique, as well as its implementation in the ALPS II experiment.