The problem of optical beam truncation through a transmitter aperture to maximize signal returns from a coherent lidar system is considered. For common transmitter and receiver apertures of the same size, the optimum ratio of receiver diameter to beam diameter is ~1.75 when viewing a far-field diffuse target. The beam diameter is defined as twice the radius at which the beam intensity is exp(−1) of the peak intensity.
© 1988 Optical Society of America
Jon Y. Wang, "Optimum truncation of a lidar transmitted beam," Appl. Opt. 27, 4470-4474 (1988)