German researchers make semiconductor laser to test relativity

The Ferdinand-Braun-Institut (FBH) in Berlin, Germany, has developed an ultra-precise, compact semiconductor laser  for measuring relativity in space. On April 23, the micro-integrated Extended Cavity Diode Laser (ECDL) was used for tests on board the German Aerospace Centre (DLR)-funded FOKUS research rocket. The aim of FOKUS is to see whether clocks run differently under space conditions like Einstein claimed by sending various types of clocks into space and back again.
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