Influence of Spatial Phase Aberration on Heterodyne Non-Imaging Array Detector
【Abstract】Taking the mismatch angle between signal and local oscillator beams as an example, we analyze the influence of spatial phase aberration on the heterodyne non-imaging array detector based on theoretical derivation and numerical calculation, and compare the array detector with the single detector with the same size. The research results reveal that the attached phase term of the signal output from detector element will severely affect the performance of the non-imaging array detector. Therefore, when only the spatial phase aberration is concerned, the array detector with a simple linear superposition cannot contribute to the performance improvement of the system. If the attached phase in the signal of detector element is eliminated by a certain method, the non-imaging array detector can greatly increase the signal-to-noise ratio of the heterodyne system even if the aberration is severe. Our results enrich the research of the non-imaging array detector in heterodyne detection and have guiding significance for the application of this technology.
【Keywords】 signal processing; heterodyne detection; array detector; mismatch angle; spatial phase aberration; signal-to-noise ratio;
 Meier A H, Roesgen T. Imaging laser Doppler velocimetry [J]. Experiments in Fluids, 2012, 52 (4): 1017–1026.
 Jiang L A, Luu J X. Heterodyne detection with a weak local oscillator [J]. Applied Optics, 2008, 47 (10): 1486–1503.
 Dong Hongzhou, Yang Ruofu, Yang Chunping, et al. Analysis on the performance of heterodyne system with nonimaging array detector [J]. Acta Optica Sinica, 2015, 35 (12): 1204001 (in Chinese).
 Luo Hanjun, Yuan Xiuhua. Accuracy of photon pulsed heterodyne detection system [J]. Chinese J Lasers, 2013, 40 (12): 1208004 (in Chinese).
 Ye Song, Xiong Wei, Wang Xinqiang, et al. Correction of spatial heterodyne interferogram based on frequency domain analysis [J]. Acta Optica Sinica, 2013, 33 (5): 0530001 (in Chinese).
 Dong Hongzhou, Ao Mingwu, Yang Ruofu, et al. Study on the angle mismatching heterodyne detection technology based on array detector [J]. Laser & Optoelectronics Progress, 2012, 49 (2): 081202 (in Chinese).
 Liu Liren. 合成孔径激光成像雷达的透镜焦面阵列外差接收光学天线: CN101630006 [P]. 2011-08-24 (in Chinese).
 Lu Dong, Sun Jianfeng, Zhou Yu, et al. Analysis on detection capability of wide field receiving synthetic aperture imaging ladar [J]. Acta Optica Sinica, 2013, 33 (7): 0728003 (in Chinese).
 Fink D. Coherent detection signal-to-noise [J]. Applied Optics, 1975, 14 (3): 689–690.
 Fink D, Samuel N V. Coherent detection SNR of an array of detectors [J]. Applied Optics, 1976, 15 (2): 453–454.
 Zhao Changzheng, Jiao Binliang, Chen Wenxin. Effect of light collimation on heterodyne efficiency for space coherent optical communication [J]. Semiconductor Optoelectronics, 2007, 28 (3): 406–413 (in Chinese).
 Bai Shiwu, Gong Yuliang. Effect of spatial collimation on signal-to-noise ratio of laser heterodyne interferometry [J]. Optical Instruments, 1994, 16 (1): 1–5 (in Chinese).
 Weyrauch T, Vorontsov M A. Free-space laser communication with adaptive optics: atmospheric compensation experiments [J]. Journal of Optical Fiber Communications Reports, 2004, 1 (4): 355–379.
 Shamir J, Caulfield H J, Hendrickson B M. Wave-front conjugation and amplification for optical communication through distorting media [J]. Applied Optics, 1988, 27 (14): 2912–2914.
 He Q C, Shamir J, Duthie J G. Wavefront conjugation and amplification for optical communication through distorting meidia: experimental [J]. Applied Optics, 1989, 28 (2): 306–316.