Share Email Print

Optical Engineering

Beam uniformity analysis of infrared laser illuminators
Author(s): Toomas H. Allik; Roberta E. Dixon; R. Patrick Proffitt; Susan Fung; Len Ramboyong; Thomas J. Soyka
Format Member Price Non-Member Price
PDF $20.00 $25.00
cover GOOD NEWS! Your organization subscribes to the SPIE Digital Library. You may be able to download this paper for free. Check Access

Paper Abstract

Uniform near-infrared (NIR) and short-wave infrared (SWIR) illuminators are desired in low ambient light detection, recognition, and identification of military applications. Factors that contribute to laser illumination image degradation are high frequency, coherent laser speckle and low frequency nonuniformities created by the laser or external laser cavity optics. Laser speckle analysis and beam uniformity improvements have been independently studied by numerous authors, but analysis to separate these two effects from a single measurement technique has not been published. In this study, profiles of compact, diode laser NIR and SWIR illuminators were measured and evaluated. Digital 12-bit images were recorded with a flat-field calibrated InGaAs camera with measurements at F/1.4 and F/16. Separating beam uniformity components from laser speckle was approximated by filtering the original image. The goal of this paper is to identify and quantify the beam quality variation of illumination prototypes, draw awareness to its impact on range performance modeling, and develop measurement techniques and methodologies for military, industry, and vendors of active sources.

Paper Details

Date Published: 16 February 2015
PDF: 5 pages
Opt. Eng. 54(2) 026103 doi: 10.1117/1.OE.54.2.026103
Published in: Optical Engineering Volume 54, Issue 2
Show Author Affiliations
Toomas H. Allik, Active EO Inc. (United States)
Roberta E. Dixon, CACI (United States)
R. Patrick Proffitt, U.S. Army RDECOM CERDEC (United States)
Susan Fung, U.S. Army RDECOM CERDEC (United States)
Len Ramboyong, U.S. Army RDECOM CERDEC NVESD (United States)
Thomas J. Soyka, U.S. Army RDECOM CERDEC NVESD (United States)

© SPIE. Terms of Use
Back to Top