Numerical simulation of heterodyne efficiency of coherent imaging ladar using rectangular element detector

Huaiyong Zhang; Qi Li; Qi Wang

doi:10.1117/12.835970

28 August 2009 Numerical simulation of heterodyne efficiency of coherent imaging ladar using rectangular element detector

Huaiyong Zhang, Qi Li, Qi Wang

Author Affiliations +

Proceedings Volume 7382, International Symposium on Photoelectronic Detection and Imaging 2009: Laser Sensing and Imaging; 738234 (2009) https://doi.org/10.1117/12.835970
Event: International Symposium on Photoelectronic Detection and Imaging 2009, 2009, Beijing, China

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%.

Citation Download Citation

Huaiyong Zhang, Qi Li, and Qi Wang "Numerical simulation of heterodyne efficiency of coherent imaging ladar using rectangular element detector", Proc. SPIE 7382, International Symposium on Photoelectronic Detection and Imaging 2009: Laser Sensing and Imaging, 738234 (28 August 2009); https://doi.org/10.1117/12.835970

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