This research focuses on speckle noise suppression by changing the angle of divergence of the diffuser. Three types of diffuser designs are compared in the experiments. For all three types, the speckle contrast value is lower than 0.027, and the speckle phenomenon is invisible to the human eye.

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High quality factor nonpolar GaN two-dimensional photonic crystal (PC) nanocavities have been fabricated and investigated. A dominated resonant mode was observed at 388 nm with quality factor of about 4300 at 77K.