Towards an engineering model of Optical Space Cs Clock

Thales Electron Devices and RUAG currently develop the engineering model of the Optical Space Cs Clock (OSCC) in the framework of an ESA/CNES project. Recent progress of the project is reported. Emphasis is put on the performance tests using new laser sources delivered by III-V Lab. The implementation of an isolator-free optics subsystem and the space evaluation of the laser and photodiode are discussed.