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Proceedings Paper

Numerical simulation of heterodyne efficiency of coherent imaging ladar using rectangular element detector
Author(s): Huaiyong Zhang; Qi Li; Qi Wang
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Paper Abstract

In coherent imaging ladar system, the round-trip time and the scan rate cause the deviation between the received signal and the transmitter beam in spatial directionality. Therefore the return signal angle lags behind the receiving optical axis angle. This lag-angle effect will cause energy loss and even the loss of return signals, which would finally affects the image quality. In order to overcome the impact of lag-angle effect on image quality, the detector with rectangular active area has been presented to replace the circular detector. In this paper, the numerical simulation of heterodyne efficiency based on rectangular detector is analyzed. And the simulation results show that heterodyne efficiency quickly declines with offset of return signal along optical axis when lag-angle effect exists. When the offset is below 0.5 and the length-width-ratio is around 1.5, the heterodyne efficiency is above 50%.

Paper Details

Date Published: 28 August 2009
PDF: 7 pages
Proc. SPIE 7382, International Symposium on Photoelectronic Detection and Imaging 2009: Laser Sensing and Imaging, 738234 (28 August 2009); doi: 10.1117/12.835970
Show Author Affiliations
Huaiyong Zhang, Harbin Institute of Technology (China)
Qi Li, Harbin Institute of Technology (China)
Qi Wang, Harbin Institute of Technology (China)

Published in SPIE Proceedings Vol. 7382:
International Symposium on Photoelectronic Detection and Imaging 2009: Laser Sensing and Imaging
Farzin Amzajerdian; Chun-qing Gao; Tian-yu Xie, Editor(s)

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