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Proceedings Paper

Laboratory experiments on synthetic-aperture laser radar with acousto-optic modulators
Author(s): HuanHuan Liu; XiaoDong Zeng; ChangQing Cao; ZheJun Feng; Chao Fu
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Paper Abstract

The diffraction limit of laser is smaller than microwave's for its shorter wavelength. Higher spatial resolution will be achieved when laser is applied to the synthetic-aperture radar, called synthetic-aperture laser radar (SAL). Just because of many advantages, in recent years the research on SAL is becoming a hotspot. One of key techniques of SAL is heterodyne detection of signals by means of linear frequency modulation pulse compression (LFM-PC); this paper introduces an experiment based on heterodyne detection with an acousto-optic frequency shifter (AOFS) in our laboratory. Detailed discussion about AOFS is presented. We find that the acousto-optic modulator can considerably influence the transmitted light beam. In particular, when the width of laser beam is larger than the effective width of acousto-optic cell, the transverse distribution of scattering light intensity is inhomogeneous, which will decrease the signal-to-noise ratio of the heterodyne detection. This paper discusses the coupled partial difference equations

Paper Details

Date Published: 28 August 2009
PDF: 8 pages
Proc. SPIE 7382, International Symposium on Photoelectronic Detection and Imaging 2009: Laser Sensing and Imaging, 73821H (28 August 2009); doi: 10.1117/12.836537
Show Author Affiliations
HuanHuan Liu, Xidian Univ. (China)
XiaoDong Zeng, Xidian Univ. (China)
ChangQing Cao, Xidian Univ. (China)
ZheJun Feng, Xidian Univ. (China)
Chao Fu, Xidian Univ. (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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