Publisher
SPIE-INT SOC OPTICAL ENGINEERINGCitation
Guanghao Chen, Brandon Hellman, Joshua Rodriguez, Braden Smith, Adley Gin, and Yuzuru Takashima "Light recycling beam steering on a DMD lidar", Proc. SPIE 10757, Optical Data Storage 2018: Industrial Optical Devices and Systems, 107570G (14 September 2018); doi: 10.1117/12.2323876; https://doi.org/10.1117/12.2323876Rights
© (2018) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE).Collection Information
This item from the UA Faculty Publications collection is made available by the University of Arizona with support from the University of Arizona Libraries. If you have questions, please contact us at repository@u.library.arizona.edu.Abstract
Spatial light modulators (SLMs) that operate in a phase modulation mode enable beam steering with higher diffraction efficiency compared to amplitude modulation mode, thus potentially be used for an efficient beam steering with no moving part. Currently, Twisted Nematic phase SLMs are widely adopted for phase modulation. However, their refresh rate is typically in the range below kilohertz. Recently, a new method for binary and spatial phase modulation using Digital Micromirror Device (DMD) was proposed by a research group in Germany. In the method, complemental self-images of DMD, corresponding to on-and off-pixels, are formed by two auxiliary optics while adding a pi phase shift between two images. The optics function as recycling of light in a coherent manner. The method enables over kilohertz refresh rate and higher diffraction efficiency in binary phase modulation mode to conventional amplitude binary modulation. As alternatives to the binary phase modulation, we propose and experimentally evaluated high-speed beam steering by DMD based on light recycling. In our experiment, with binary phase modulation mode, system output efficiency reaches 8%. It can be doubled to 16% with light recycling method. Efficiency is still low compared to the reported value of 27% without light recycling. To further increase beam efficiency, system loss was analysed.ISSN
97815106208589781510620865
Version
Final published versionAdditional Links
https://www.spiedigitallibrary.org/conference-proceedings-of-spie/10757/2323876/Light-recycling-beam-steering-on-a-DMD-lidar/10.1117/12.2323876.fullhttps://www.spiedigitallibrary.org/conference-presentations/10757/107570G/Light-recycling-beam-steering-on-a-DMD-lidar/10.1117/12.2323876.5836679365001
ae974a485f413a2113503eed53cd6c53
10.1117/12.2323876