Magnetic Fast Steering Mirror for Inter-satellites and Feeder Link Optical Communication

Starting from M-FSM62 former design heritage, CTEC has designed first the M-FSM45 dedicated to Giant constellations based on inter-satellites Communication, focusing on mandatory cost efficiency, with high repeatability of performances and reliability, while targeting no defect at customer integration over quantities beyond several thousands of units delivered in very short production time series. After successful achievement of M-FSM45 Engineering Models design and testing, CTEC is proposing alternate MFSM-HPL (High Power Laser) design dedicated to Feederlink applications. The proposed design has been optimized for continuous laser power under vacuum, ranging from 40W to 80W, leading to SiC mirror design with very high reflectivity, and high conductivity. Together with the mirror heat conduction design optimization, a drastic improvement of the FSM heat sinking has been achieved, in order to maintain low equilibrium temperature on mirror surface, together with low thermal gradient, in order to cope with stringent wave front error (WFE) requirement. The FSM size has been increased in order to implement two redundant coils assemblies, each connectable to two separate drive electronics (redundant and nominal).

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