The following is a list of problems, one or more of which has been said to severely limit the performance of Optical SETI systems.
| 1. | Quantum noise. |
| 2. | Planckian starlight. |
| 3. | Doppler shift. |
| 4. | Doppler chirp (drift). |
| 5. | Laser linewidth. |
| 6. | Limitation on beamwidth 1 arcsecond. |
| 7. | Don't know "magic frequencies". |
| 8. | Lack of suitable local oscillator lasers. |
| 9. | Too many frequencies to search. |
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The Columbus Optical SETI Observatory |
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