Laser system for navigation beacons and lights - provides directional transmission of luminous cylinder of light of selected frequency

摘要

A laser type light or beacon for aircraft or maritime navigation provides a directional transmission of a selected frequency of monochromatic light. Such an installation may be ground based or mounted on a geostationary satellite and is of reduced size since reflectors and lenses are not required. The laser provides a luminous cylinder of light of any chosen colour which is visible in daylight. A single emitting source permits a horizontal sweep of several kilometers to be made. A high power installation for a lighthouse or beacon is made by switching the illumination on and off in millisecond periods. Identification of an installation may be made from the colour of the emitted light.