A novel integrated optic approach to the design and manufacture of an optical subsystems for a Range-Doppler imaging lidar is described and demonstrated. The approach uses hollow waveguides to guide light between system components which are integrated into a common substrate. The design, manufacture and operation of an eleven element subsystem which is compact, rugged and provides coherent mixing efficiencies in excess of 80% of the theoretical maximum, are discussed. The results of trials of the subsystem at the Army Missile Optical Range, involving measurement of Range-Doppler images of representative targets are described.© (2000) COPYRIGHT SPIE--The International Society for Optical Engineering. Downloading of the abstract is permitted for personal use only.