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arXiv · 1902.05371

A Proposed Method for a Photon-Counting Laser Coherence Detection System to Complement Optical SETI

David M. Benton
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Abstract

The detection of laser radiation originating from space is a positive indicator of Extra Terrestrial Intelligence (ETI). Thus far the optical search for ETI (OSETI) has looked for enhanced brightness in the form of either narrow-band spectral emission or time correlated photons from laser pulses. In this paper it is proposed to look for coherence properties of incoming light in a manner that can distinguish against atomic emission lines. The use of photon sensitive detectors and a modulating asymmetric interferometer has been modelled. The results suggest that the sensitivity of detection for continuous laser sources would be better than current spectroscopic approaches, with detection thresholds of $<$1 photon s$^{-1}$m$^{-2}$ against a background with a spectral bandwidth of 0.1nm over an observation time of 750s.

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David M. Benton. 2019-02-14. A Proposed Method for a Photon-Counting Laser Coherence Detection System to Complement Optical SETI. https://doi.org/10.1088/1538-3873%2Fab1a46

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