Optical Detection of Lasers with Near-term Technology at Interstellar Distances

@article{Clark2018OpticalDO,
  title={Optical Detection of Lasers with Near-term Technology at Interstellar Distances},
  author={James R. Clark and Kerri L. Cahoy},
  journal={The Astrophysical Journal},
  year={2018},
  volume={867}
}
This paper examines the ability to produce a laser beam detectable to a cursory survey (SNR 0.1% with a 1 m receive telescope) by an extraterrestrial intelligence using proven or near-term technology (megawatt-class lasers, telescopes tens of meters in size). We find that such lasers can produce a signal at ranges of less than 20,000 lt-yr, with a broad enough beam to overcome uncertainties in nearby exoplanet orbits (e.g., Prox Cen b) or encompass entire habitable zones of more distant systems… 

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