Rodriguez Joshua, Smith Braden, Hellman Brandon, Takashima Yuzuru
Appl Opt. 2020 Aug 1;59(22):G239-G248. doi: 10.1364/AO.393075.
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 a 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 of 2 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.
通过在每次数字微镜器件（DMD）驱动期间同步多个纳秒激光源和脉冲，基于衍射的光束转向的采样率和角分辨率可以同时提高至少一个数量级。一种具有三个光源的飞行时间单芯片DMD激光雷达，在48°视场范围内以3.34 kHz的采样率和3.4°的角分辨率测量距离。利用DMD的多个衍射级至少可将采样率提高2倍，最高可达DMD支持的衍射级数。通过在微镜的单个转换周期内多次照射微镜，实验证明了采样率提高到6.68 kHz，角分辨率为9.6°。
