A Zemax Analysis of a LIDAR Optical System to Compare Target Spot Size to Laser Input Angles and Beam Diameter

Report No. ARL-TR-8830
Authors: Karl K Klett Jr, Barry Stann, and Bradley DeRoos
Date/Pages: October 2019; 16 pages
Abstract: This report describes the performance of optics that are part of a light imaging detection and ranging (LIDAR) system at the CCDC Army Research Laboratory. Part of the optics system consists of a tilt mirror that redirects a laser through lenses so the output location of the beam may be changed. The purpose of this analysis is to understand how the output angle changes with input angle, the dependence of the target spot size on the input angle, and how the laser beam diameter affects the target spot size. Using Zemax, a simulated laser was projected into the optical system at angles varying from 0° to 6°, and the output spot size varied from a 0.83-m circle at an input angle of 0° to a 13.2- x 3-m oval at an input angle of 6° using a 1-mm input beam. The output angles are a factor of five greater than the input angles.
Distribution: Approved for public release
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Last Update / Reviewed: October 1, 2019