Fig. 4: Optical ranging using the frequency-agile, hybrid integrated laser.
From: Low-noise frequency-agile photonic integrated lasers for coherent ranging
a Schematic of the setup for FMCW LiDAR measurement. A triangular ramp with 150 V peak-to-peak amplitude at 100 kHz rate is applied to the AlN piezoactuator providing a 1.2 GHz optical frequency excursion of the self-injection locked DFB laser. Beam steering is realised using a mechanical galvo scanner with two mirrors. b Photos of the target - a donut in front of a PC monitor. c Time-frequency plot for a signal from the target. d Histogram of distance distribution in the point cloud. e–g Point cloud of the target from different perspectives using a beam scanning pattern with 3 Hz vertical and 60 Hz horizontal triangular scanning frequencies. Point colours are based on distance. Donut corresponds to blue, PC monitor - green, wall - yellow.
