A directed search for extraterrestrial laser signals

Astronomy and Astrophysics – Astronomy

Scientific paper

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Infrared Lasers, Interstellar Communication, Optical Communication, Optical Heterodyning, Project Seti, Feasibility Analysis, Infrared Spectrometers, Radio Signals, Signal Detection, Signal To Noise Ratios

Scientific paper

This paper analyzes the technical feasibility of interstellar communication at infrared frequencies, both in its own right and in comparison with communication at radio frequencies. The analysis considers both the practical and fundamental limits affecting communication over interstellar distances and concludes that for specified transmitter and receiver locations communications at infrared and radio frequencies can be equally effective. On this basis a search for extraterrestrial signals at infrared wavelengths is equally as valid as any planned microwave effort. Work is now in progress to adapt a 10 micron heterodyne spectrometer to search for CO2 laser signals from 200 nearby stars.

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