Dynamic measurement of beam divergence angle of different fields of view of scanning lidar

doi:10.1088/1674-1056/abc155

Abstract The laser beam divergence angle is one of the important parameters to evaluate the quality of the laser beam. It can not only accurately indicate the nature of the beam divergence when the laser beam is transmitted over a long distance, but also objectively evaluate the performance of the laser system. At present, lidar has received a lot of attention as a core component of environment awareness technology. Micro-electromechanical system (MEMS) micromirror has become the first choice for three-dimensional imaging lidar because of its small size and fast scanning speed. However, due to the small size of the MEMS micromirror, the lidar scanning system has a small field of view (FOV). In order to achieve a wide range of scanning imaging, collimating optical system and wide-angle optical system are generally added to the system. However, due to the inherent properties of the optical lens, it is impossible to perfect the imaging, so the effects of collimating and expanding the beam will be different at different angles. This article aims to propose a measurement system that dynamically measures the divergence angles of MEMS scanning lidar beams in different fields of view to objectively evaluate the performances of scanning lidar systems.

Keywords: laser divergence angle lidar CCD different fields of view (FOV)

Received: 30 July 2020
Revised: 28 August 2020
Accepted manuscript online: 15 October 2020

PACS:	42.55.-f	(Lasers)
	42.79.Qx	(Range finders, remote sensing devices; laser Doppler velocimeters, SAR, And LIDAR)
	42.30.-d	(Imaging and optical processing)

Fund: Project supported by the National Key Scientific Instrument and Equipment Development Projects of China (Grant No. 62027823), the Shenzhen Fundamental Research Program (Grant No. JCYJ2020109150808037), and the National Natural Science Foundation of China (Grant No. 61775048).

Corresponding Authors: ^†Corresponding author. E-mail: wangch_hit@163.com

Cite this article:

Qing-Yan Li(李青岩), Shi-Yu Yan(闫诗雨), Bin Zhang(张斌), and Chun-Hui Wang(王春晖) Dynamic measurement of beam divergence angle of different fields of view of scanning lidar 2021 Chin. Phys. B 30 024205

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