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Proceedings Paper

A common aperture active imaging system
Author(s): Ning Zhang; Yi Tang; Lijun Zhang; Gang Huang
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Paper Abstract

In this paper, the researches and experiments on the feasibility of a common aperture active imaging system using a polarization beam splitter have been presented. The system includes a CCD imaging unit, a semiconductor laser unit, a polarization beam splitter, a linear polarizer, a quarter-wave plate, a telescope objective, a designed laser collimating lens and mechanical assembling structures. According to the analysis with Jones matrix, the system gains remarkably high utilization ratio of luminous energy. Also, the system can reach an illuminating distance of 3km, a laser divergence angle of 0.504° and a degree of uniformity of 83% theoretically. The experiments have been conducted to obtain images of objects at 300m and 3km. From the results, clear illuminated objects can be identified and no impacts of back scattering of atmosphere turbulence have been detected. However, to make this kind of systems more effective, higher demands on the extinction ratio, reflectivity and transmissivity of the polarized components and the uniformity of the illuminating spot should be met.

Paper Details

Date Published: 12 November 2010
PDF: 9 pages
Proc. SPIE 7844, Semiconductor Lasers and Applications IV, 78440W (12 November 2010); doi: 10.1117/12.870216
Show Author Affiliations
Ning Zhang, Beijing Institute of Technology (China)
Yi Tang, Beijing Institute of Technology (China)
Lijun Zhang, Beijing Institute of Technology (China)
Gang Huang, Beijing Institute of Technology (China)

Published in SPIE Proceedings Vol. 7844:
Semiconductor Lasers and Applications IV
Ning-Hua Zhu; Jinmin Li; Farzin Amzajerdian; Hiroyuki Suzuki, Editor(s)

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