Theory of speckle suppression in a laser projector based on a long multimode fiber

Laser speckle reduction using polymer-stabilized liquid crystals doped with Ag nanowires

“…Wavelength, angular, and polarization diversity are mainly used in the former, specifically using random lasers, multimode fibers, light pipes, arrays of optical waveguides, diffusers, and diffraction optical elements (DOEs). The latter usually requires the introduction of mechanical devices for further speckle reduction [ [6] , [7] , [8] , [9] , [10] , [11] , [12] , [13] , [14] , [15] , [16] , [17] , [18] , [19] ]. The simplest and most effective speckle-reduction method is the introduction of a moving diffuser, which generates angular diversity through light scattering and achieves time-averaging of intensities through diffuser movement [ [9] , [10] , [11] , [12] ].…”