Abstract
Space laser communications with the frequency doubled Nd-YAG laser offers the most efficient means for transferring wideband data from one satellite to another. A space test in 1981 of the Nd-YAG laser system operating at a rate of 1 000 Mbit s -1 will establish the basis for future systems. The system offers growth capability beyond conventional systems and is a major step forward in the application of a low power laser. The Nd-YAG laser design as well as its principles of operation are constrained by the space application. The laser is now conductively cooled, mode-locked, and frequency-doubled, and will be so operated in space. The space system will use both solar and lamp pumped lasers to allow alternate modes of operation.
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