The GAIA spacecraft was launch in December 2013 heading for its observation site at L2. Onboard is the OSE (Optical Sources and Electronics) unit, developed by KDA and part of the laser metrology system, monitoring the line of sight of the two telescopes capturing the faint light from the distant stars. The OSE comprises a wavelength stabilized laser, exhibiting a relative wavelength stability better than 8× 10-8 for any 5 seconds period.

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