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A directed search for extraterrestrial laser signals.
1Space Sciences Laboratory, University of California, Berkeley 94720, USA.
Acta Astronautica
|January 1, 1986
Summary
This study shows infrared frequencies are as effective as radio waves for interstellar communication. Searching for extraterrestrial signals using infrared wavelengths is a valid approach alongside microwave efforts.
Area of Science:
- Astrobiology
- Astronomy
- Signal Processing
Background:
- Interstellar communication is a key area in the search for extraterrestrial intelligence (SETI).
- Radio frequencies have been historically prioritized for SETI due to practical considerations.
- The potential of other frequency bands, such as infrared, remains less explored.
Purpose of the Study:
- To analyze the technical feasibility of interstellar communication using infrared frequencies.
- To compare the effectiveness of infrared versus radio frequencies for interstellar communication.
- To assess the validity of infrared wavelengths for SETI signal detection.
Main Methods:
- Analysis of practical and fundamental limits for interstellar communication.
- Comparative study of infrared and radio frequency communication channels.
- Adaptation of a 10 micrometer heterodyne spectrometer for signal detection.
Main Results:
- Infrared and radio frequencies can be equally effective for interstellar communication under specified conditions.
- The analysis considered both technological and physical limitations over vast distances.
- Infrared communication is technically feasible for interstellar distances.
Conclusions:
- A search for extraterrestrial signals at infrared wavelengths is as scientifically valid as radio-based searches.
- Infrared SETI efforts are a complementary and equally promising avenue.
- Ongoing work focuses on detecting CO2 laser signals from nearby stars using infrared technology.