Holographic Beam Shaping for Optical Heterodyne Arrays in Laser Radars.

摘要

Laser systems using coherent optical heterodyne detection of signals have recently become interesting for a variety of applications including imaging, communications, spectroradiometry, and optical/infrared radar. In a number of these applications it is advantageous to use arrays of detectors to increase angular, spatial, or spectral coverage. Arrays permit this coverage to be increased while maintaining or reducing requirements in scanner systems, laser pulse rates, and individual detector bandwidths. This paper describes a new holographic technique for performing the beam shaping in amplitude and phase which is required for high signal-to-noise and high resolution array performance. In this paper we review the holographic team shaping concept as applied to heterodyne arrays and its relation to laser radar systems. Experimental results are presented for holographic beam shaping devices using both linear and binary techniques.