Laboratory experiments on synthetic-aperture laser radar with acousto-optic modulators

HuanHuan Liu; XiaoDong Zeng; ChangQing Cao; ZheJun Feng; Chao Fu

doi:10.1117/12.836537

28 August 2009 Laboratory experiments on synthetic-aperture laser radar with acousto-optic modulators

HuanHuan Liu, XiaoDong Zeng, ChangQing Cao, ZheJun Feng, Chao Fu

Proceedings Volume 7382, International Symposium on Photoelectronic Detection and Imaging 2009: Laser Sensing and Imaging; 73821H (2009) https://doi.org/10.1117/12.836537
Event: International Symposium on Photoelectronic Detection and Imaging 2009, 2009, Beijing, China

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

Citation Download Citation

HuanHuan Liu, XiaoDong Zeng, ChangQing Cao, ZheJun Feng, and Chao Fu "Laboratory experiments on synthetic-aperture laser radar with acousto-optic modulators", Proc. SPIE 7382, International Symposium on Photoelectronic Detection and Imaging 2009: Laser Sensing and Imaging, 73821H (28 August 2009); https://doi.org/10.1117/12.836537

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KEYWORDS

Acousto-optics

Heterodyning

Acoustics

Signal detection

Crystals

LIDAR

Beam splitters

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