Optical Phased Array-Based Laser Beam Array Subdivide Pixel Method for Improving Three-Dimensional Imaging Resolution
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Published:2023-12-09
Issue:12
Volume:10
Page:1360
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ISSN:2304-6732
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Container-title:Photonics
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language:en
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Short-container-title:Photonics
Author:
Wang Shuai12ORCID, Yuan Gang1, Wang Kun-Peng1, Sun Guang-De2, Liu Lei2, Li Ling1, Zhang Bing1, Quan Lin1
Affiliation:
1. Beijing Institute of Tracking and Communication Technology, Beijing 100094, China 2. School of Space Information, Space Engineering University, Beijing 101416, China
Abstract
The small number of pixels in the current linear mode avalanche photodiode (LM-APD) array limits its three-dimensional (3D) imaging resolution. We use an optical phased array-based beam array subdivided pixel method to improve the 3D imaging resolution, using an optical phased array to generate a beam array with the same number of pixels as the LM-APD array and matching positions and controlling each sub-beam in the beam array to scan in the field of view of the corresponding pixel. The sub-beam divergence angle in the beam array is smaller than the instantaneous field of view angle of a single pixel in the LM-APD array. The sub-beam scanning in a single pixel’s field of view realizes the multiple acquisition of the target 3D information by the LM-APD array, thus improving the resolution of the LM-APD array. The distribution of the beam array in the far field is simulated, and the main performance parameters of 3D imaging are analyzed. Finally, a liquid crystal phase modulator is used as an optical phased array device to conduct experiments on a target 20 m away, and the results prove that our method can improve the resolution from 4 × 4 to 8 × 8, which can be improved at least four times.
Subject
Radiology, Nuclear Medicine and imaging,Instrumentation,Atomic and Molecular Physics, and Optics
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