http://arxiv.org/abs/1902.05371
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 order 10-20 photons/s against a background with a spectral bandwidth of 0.1nm over an observation time of 750s.
D. Benton
Fri, 15 Feb 19
3/48
Comments: 13 pages, 5 figures
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