  We have developed, assembled, and flight-proven a stable, compact, and
autonomous extended cavity diode laser (ECDL) system designed for atomic
physics experiments in space. To that end, two micro-integrated ECDLs at 766.7
nm were frequency stabilized during a sounding rocket flight by means of
frequency modulation spectroscopy (FMS) of 39^K and offset locking techniques
based on the beat note of the two ECDLs. The frequency stabilization as well as
additional hard- and software to test hot redundancy mechanisms were
implemented as part of a state-machine, which controlled the experiment
completely autonomously throughout the entire flight mission.
