Abstract
A factor-of-four increase in the operating speed of a high-resolution low-temperature-grown photorefractive multiple-quantum-well (PRMQW) spatial light modulator is reported. This is achieved by shining a spatially uniform erasing pulse from a light-emitting diode (LED) on the device that is driven by a single-sided applied voltage. The erasing pulse is turned on briefly during the off-voltage cycle while a grating is written during the on-voltage cycle using a continuous-wave laser diode. The dependence of the change in diffraction efficiency on the frequency of the applied voltage, on the timing and duration of the LED pulse, and on the intensities of the LED and of the pump beams has been investigated. Our results are relevant to applications of PRMQW modulators where both high spatial resolution and fast operating speed are required.
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