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

Research output: Contribution to journalArticle

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 photonsensitive detectors and a modulating asymmetric interferometer has been modeled. 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 0.1 nm over an observation time of 750 s.

Original languageEnglish
Article number074501
Number of pages13
JournalPublications of the Astronomical Society of the Pacific
Volume131
Issue number1001
DOIs
Publication statusPublished - 22 May 2019

Bibliographical note

© 2019 The Author

Keywords

  • Coherence
  • Photon counting
  • Seti

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