Fast laser beam steering into multiple diffraction
orders with a single digital micromirror device
for time-of-flight lidar
Posted on 2020-07-16 - 21:48
The sampling rate and angular resolution of diffraction-based beam steering
employing a Digital Micromirror Device (DMD) can be simultaneously enhanced by at least
an order-of-magnitude by synchronizing multiple nanosecond laser sources and pulses
during each DMD actuation. A time-of-flight single-chip DMD lidar with three sources
measures range at a 3.34 kHz sampling rate and a 3.4° angular resolution across a 48° field
of view. Employing multiple diffraction orders of the DMD improves the sampling rate at
least by a factor two and up to the number of diffraction orders supported by the DMD. An
improved sampling rate of 6.68 kHz with a 9.6° angular resolution is experimentally
demonstrated by illuminating micromirrors multiple times within a single transition period
of the micromirrors.
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Rodriguez, Joshua; Smith, Braden; Hellman, Brandon; Takashima, Yuzuru (2020). Fast laser beam steering into multiple diffraction
orders with a single digital micromirror device
for time-of-flight lidar. Optica Publishing Group. Collection. https://doi.org/10.6084/m9.figshare.c.4896327.v1