Applications of lasers to imaging of distant objects

摘要

Abstract: blem of imaging distant objects throughatmospherically- induced aberrations has attractedconsiderable attention is recent years. Such imagingoften requires active laser illumination for tworeasons: the received signal must be enhanced, andspecific spatial and temporal coherence properties arerequired to obtain an image. Many different activeillumination techniques are available: these includeDoppler, range, and angle-angle imaging, as well astechniques from stellar speckle interferometry andholography. The various techniques are compared interms of illuminator power and waveformrequirements.!18