Researchers have developed a new chip-based beam steering technology that provides a promising route to small, cost-effective, and high-performance lidar systems. Lidar, or light detection and ranging, uses laser pulses to acquire 3D information about a scene or object. It is used in a wide range of
applications such as autonomous driving, 3D holography, biomedical sensing, free-space optical communications, and virtual reality.
Hao Hu and Yong Liu developed a chip-based OPA that accomplishes beam steering with a wide field of view without compromising beam quality. The device could enable small, cost-effective and high-performance lidar systems. Credit: Hao Hu, Technical University of Denmark “We believe our results are groundbreaking in the field of optical beam steering,” said Hu. “This development lays the groundwork for OPA-based lidar that is low cost and compact, which would allow lidar to be widely used for a variety of applications such as high-level advanced driver-assistance systems that can assist in driving and parking and increase safety.”OPAs perform beam steering by electronically controlling light’s phase profile to form specific light patterns.
They then characterized beam steering in the vertical direction by tuning the wavelength from 1480 nm to 1580 nm, achieving a 13.5° tuning range. Finally, they showed the versatility of the OPA by using it to form 2D images of the letters “D”, “T” and “U” centered at the angles of -60°, 0° and 60° by tuning both the wavelength and the phase shifters. The experiments were performed with a beam width of 2.
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