Laser emitted through the off-axis Cassegrain antenna

Si-chen Lei; Xi-zheng Ke; Juan Chen

doi:10.1117/12.2034630

21 August 2013 Laser emitted through the off-axis Cassegrain antenna

Si-chen Lei, Xi-zheng Ke, Juan Chen

Proceedings Volume 8906, International Symposium on Photoelectronic Detection and Imaging 2013: Laser Communication Technologies and Systems; 89061Z (2013) https://doi.org/10.1117/12.2034630
Event: ISPDI 2013 - Fifth International Symposium on Photoelectronic Detection and Imaging, 2013, Beijing, China

Abstract

Cassegrain antenna is commonly used in Free Space Optic communication system. The double reflection structure determines the system has a shade problem. In this paper, the off-axis emission (semi-aperture lighting) method is applied to solve the shade problem caused by the secondary mirror. This method is simple both in structure an implement. ZEMAX software and Fourier optics are used to analyze the Cassegrain antenna theoretically. We can improve the performance of Cassegrain antenna under the guidance of the analytical results. Some experiment has been carried out. The results showed that the percentage of exit-pupil power effectively increased from 9% to 53%, the diameter of spot was not exceeding 200mm at the distance of 600m.It is significant for engineering applications.

Citation Download Citation

Si-chen Lei, Xi-zheng Ke, and Juan Chen "Laser emitted through the off-axis Cassegrain antenna", Proc. SPIE 8906, International Symposium on Photoelectronic Detection and Imaging 2013: Laser Communication Technologies and Systems, 89061Z (21 August 2013); https://doi.org/10.1117/12.2034630

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