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Phase randomization for spatiotemporal averaging of unwanted interference effects arising from coherence

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Abstract

An approach to the reduction of unwanted interference effects, such as speckle and inhomogeneity, is to generate sequences of uncorrelated effects over the integration period of the sensor such that they are averaged. A moving diffuser is typically used. An innovative deformable mirror technology is presented as an alternative. Through phase randomization it achieves dynamic divergence of illumination without diffraction losses. It is shown to offer a unique combination of advantages over moving diffusers, including optical efficiency, speed, size, and reliability. Various applications are discussed.

© 2018 Optical Society of America

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