Driven by the demands for speed and field of view in the holographic photostimulation community, we designed, built,and tested a liquid crystal on silicon (LCoS) spatial light modulator (SLM) with a 1536x1536 square pixel array andhigh-voltage LC drive. We discuss some of the engineering work that made the MacroSLM possible, including thecustom FPGA board for handling huge data rates, the large pixel size for minimizing rolloff and crosstalk, and thetemperature control to handle heating effects from the high-voltage controls and high-power laser illumination. We alsodesigned an FPGA implementation of the overdrive method for increasing liquid crystal switching speed, allowing us toovercome the significant data bottlenecks that limit frame rates for large arrays. We demonstrate 500 Hz hologram-tohologramspeed at 1064 nm operating wavelength, and discuss the new science that these speeds and array sizes haveenabled.
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