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Laser communication in space

14.06.2008

German physicists transmit information between spacecraft using a laser.

Satellites now use radio signals to communicate. However, with their help, it is no longer possible to transfer the volumes of data that modern researchers need. There is a solution: switch to light waves. They have a much shorter wavelength, respectively, and more information will fit.

As German engineers from the Fraunhofer Institute for Laser Technology found out during recent tests, when using a laser, the information density increases a hundred times and provides the transfer of its volume equivalent to 400 DVDs per hour. They quite successfully transmitted information over a distance of 5000 km from German to an American satellite.

"The laser must be small and reliable. We managed to create such a design that its size does not exceed the size of a matchbox, and the weight corresponds to a bar of chocolate. It withstood extremely difficult conditions: temperatures from -35 to 60 ° C, acceleration of 1300 g and gamma irradiation "rays," says project manager Martin Traub. "However, the laser power is several watts, and we have not yet decided how to dissipate the heat generated during operation."

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