Characteristics analysis and test of LiDAR based on diffraction lens receiving

Wang Ling; Liu Bo; Wu Cheng; Luo Lan; Yang Yuqiang

doi:10.12086/oee.2024.240032

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Wang L, Liu B, Wu C, et al. Characteristics analysis and test of LiDAR based on diffraction lens receiving[J]. Opto-Electron Eng, 2024, 51(3): 240032. doi: 10.12086/oee.2024.240032

Citation:

Wang L, Liu B, Wu C, et al. Characteristics analysis and test of LiDAR based on diffraction lens receiving[J]. Opto-Electron Eng, 2024, 51(3): 240032. doi: 10.12086/oee.2024.240032

Characteristics analysis and test of LiDAR based on diffraction lens receiving

1.
National Key Laboratory of Optical Field Manipulation Science and Technology, Chinese Academy of Sciences, Chengdu, Sichuan 610209, China
2.
Key Laboratory of Science and Technology on Space Optoelectronic Precision Measurement, Chinese Academy of Sciences, Chengdu, Sichuan 610209, China
3.
Institute of Optics and Electronics, Chinese Academy of Sciences, Chengdu, Sichuan 610209, China
4.
University of Chinese Academy of Sciences, Beijing 100049, China

More Information

Corresponding author: boliu@ioe.ac.cn

Received Date 31 January 2024

Revised Date 20 March 2024

Accepted Date 20 March 2024

Published Date 05 April 2024

Abstract

Abstract

The optimization and design of optical systems is an important research direction in LiDAR. In this paper, the advantages of diffractive optical elements (DOE), such as high design degree of freedom and large dispersion, are used in the receiving end of LiDAR. The focusing and filtering effects are realized at the same time, which reduces the complexity of the optical system. Based on the principle of diffractive optical elements, the optical characteristics of diffractive optical elements are simulated and analyzed. The LiDAR ranging experiment is completed by using the diffractive optical element as the optical receiving end of the LiDAR. It proved that the diffractive optical elements have both a focusing effect and a narrow-band filtering effect. The experimental results are basically consistent with the simulation. Using the advantages of diffractive optical elements in LiDAR, the lightweight, integration, and high efficiency of LiDAR can be realized.
- LiDAR /
- diffractive optical element /
- lightweight /
- filtration

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References

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Overview

Overview

LiDAR is an advanced active detection system that combines laser technology and photoelectric detection technology, which can obtain the three-dimensional spatial information of the target quickly and accurately and is widely used in civil, aerospace, and military fields such as autonomous driving, space rendezvous, and docking, target recognition and so on. The design and optimization of optical systems is an important research direction for LiDAR systems. The traditional LiDAR receiver generally uses a set of lenses and filters (such as an interference filter, dispersion filter, etc) to achieve the focusing and filtering functions of the echo energy. The two are independent devices, which increases the complexity of the system. In contrast, the diffractive optical element (DOE) uses micro-nano processing technology to etch relief structure on the substrate to achieve phase control and has the advantages of lightweight and large dispersion, which can be introduced into the LiDAR receiver to achieve focusing and filtering functions at the same time. In this paper, the characteristics of DOE at the receiving end of LiDAR are analyzed and tested. Firstly, we simulate the filtering characteristics of the combination of DOE and fiber, and the formula between the fiber core diameter and the filter bandwidth is given, that the smaller the diameter of the fiber core, the better the filtering effect. For example, the equivalent bandwidth of the fiber with 10 μm core diameter combined with DOE is 0.6 nm and the 200 μm core diameter is 12 nm. Secondly, a LiDAR ranging system based on DOE receiving was set up, with 1064 nm designed wavelength, 50 mm aperture, and 300 mm focal length. The system successfully measures the range of the 2.1 km target outside the experimental platform. Finally, the filtering ability of DOE was tested by using single mode fiber with 10 μm core diameter and multimode fiber with 200 μm core diameter respectively. Through comparative experiments, it is verified that the DOE is applied to the LiDAR receiver to achieve focusing, and it also has a narrow-band filtering effect to suppress noise when combined with the fiber, which is consistent with the simulation. In summary, the advantages of DOE in LiDAR are used to realize the lightweight, integration, and high efficiency of LiDAR.