Frequency–angular resolving LiDAR using chip-scale acousto-optic beam steering
Frequency–angular resolving LiDAR using chip-scale acousto-optic beam steering
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DOI：
10.1038/s41586-023-06201-6
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发表时间：
2023-05
期刊：
影响因子：
64.8
通讯作者：
Bingzhao Li;Qixuan Lin;Mo Li
中科院分区：
文献类型：
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作者：
Bingzhao Li;Qixuan Lin;Mo Li
凭借其卓越的成像分辨率和范围，光探测和测距 (LiDAR) 正迅速成为包括自动驾驶车辆和机器人在内的智能自动化系统不可或缺的光学感知技术。下一代激光雷达系统的开发迫切需要一种在空间中扫描激光束的非机械光束控制系统。已经开发了各种光束控制技术，包括光学相控阵、空间光调制、焦平面开关阵列、色散频率梳和光谱时间调制。然而，其中许多系统仍然体积庞大、脆弱且昂贵。在这里，我们报告了一种片上声光光束转向技术，该技术仅使用单个千兆赫兹声换能器将光束转向自由空间。该技术利用布里渊散射的物理原理，即以独特的频移标记以不同角度转向的光束，使用单个相干接收器来解析频域中物体的角位置，并实现频率角解析激光雷达。我们展示了一种简单的设备结构、波束控制控制系统和频域检测方案。该系统实现了调频连续波测距，视场角为 18°，角分辨率为 0.12°，测距距离可达 115 米。该演示可以扩展到阵列，实现具有宽二维视场的微型、低成本频率角分辨激光雷达成像系统。这一发展代表着激光雷达在自动化、导航和机器人技术领域的广泛应用又向前迈出了一步。
Thanks to its superior imaging resolution and range, light detection and ranging (LiDAR) is fast becoming an indispensable optical perception technology for intelligent automation systems including autonomous vehicles and robotics, –. The development of next-generation LiDAR systems critically needs a non-mechanical beam-steering system that scans the laser beam in space. Various beam-steering technologies have been developed, including optical phased array, , –, spatial light modulation, –, focal plane switch array,, dispersive frequency comb,and spectro-temporal modulation. However, many of these systems continue to be bulky, fragile and expensive. Here we report an on-chip, acousto-optic beam-steering technique that uses only a single gigahertz acoustic transducer to steer light beams into free space. Exploiting the physics of Brillouin scattering,, in which beams steered at different angles are labelled with unique frequency shifts, this technique uses a single coherent receiver to resolve the angular position of an object in the frequency domain, and enables frequency–angular resolving LiDAR. We demonstrate a simple device construction, control system for beam steering and frequency domain detection scheme. The system achieves frequency-modulated continuous-wave ranging with an 18° field of view, 0.12° angular resolution and a ranging distance up to 115 m. The demonstration can be scaled up to an array realizing miniature, low-cost frequency–angular resolving LiDAR imaging systems with a wide two-dimensional field of view. This development represents a step towards the widespread use of LiDAR in automation, navigation and robotics.