Single-chip holographic beam steering for lidar by a digital micromirror device with angular and spatial hybrid multiplexing

A digital micromirror device (DMD) based holographic beam steering technique is reported that multiplexes fine-steering binary amplitude gratings with a coarse-steering programmable blazed grating. The angular spatial light modulation (ASLM) technique encodes the spatial pattern of the binary amplitude grating at the same plane as the angular modulation set by a phase map of the DMD-based beam steering technique. The beam steering technique is demonstrated at 532 nm and implemented into a 905 nm lidar system. The results of the lidar system tests are presented, achieving a 44 degrees field-of-view, 0.9 degrees x0.4 degrees (HxV) angular resolution, 1 m max distance, 1.5 kHz sampling, and 7.8 FPS video. Scalability techniques are proposed, including max distance increases to over 100 m. (C) 2020 Optical Society of America under the terms of the OSA Open Access Publishing Agreement