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Speckle Suppression in Laser Projection Optical Path
Pages: 62-66
Year: Issue:  5
Journal: Optics & Optoelectronic Technology

Keyword:  optical designlaser specklepiezoelectric ceramicsphase platespeckle suppressionlaser projection display;
Abstract: In order to improve the image quality of the projector,a laser beam is used as the illumination source.The laser beam is expanded and collimated,and the phase plate is used in phase modulation.The combination of the RGB light sources is realized by the X prism.To solve the problem of laser speckle,a method of dividing the laser beam into several independent laser pulses is proposed by using the piezoelectric ceramic and the phase plate,and generating N independent speckle images.These independent laser speckle patterns are superposed so as to achieve the restraining of laser speckle.Theoretically the speckle contrast can be reduced to 1/N of the original contrast after superposition.In 20 milliseconds,the phase plate achieves the superposition of 30 independent speckle patterns.Through the speckle pattern collection and analysis it is found that a single speckle pattern contrast ratio is 0.993,and the contrast drops to 0.191 after the superposition.The superposition of the pattern restrains the contrast of the speckle.This provides a reference for the subsequent laser projection optical path design.
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