Two consortia have undertaken parallel pre-phase A studies funded by ESA to determine a preferred concept for ALADIN (Atmospheric Laser Doppler Instrument). This paper reports the results of the laser transmitter study forming part of the Domier led instrument study. The requirements were for a high energy, frequencystable, pulsed CO2 laser, operating at 9. 1 1jm with a high efficiency and long lifetime. The optimum discharge technology, resonator design, pulse energy and pulse length were determined and numerical frequency chirp modelling carried out. A preliminary design was developed for a compact, lightweight device and critical technology areas identified.
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