Realization system for laser speckle restraining based on optical diffraction element

Abstract

A realization system for laser speckle restraining based on an optical diffraction element comprises an optical module and an electrical control module, the optical module comprises a modulation lens component, the binary optical diffraction element and a focusing objective lens. The modulation lens component, the binary optical diffraction element and the focusing objective lens are located in the same optical axis, laser beams emitted by a laser device are expanded, shaped and calibrated through the modulation lens component and carry out normal incidence on the plane of the binary optical diffraction element, the binary optical diffraction element can be horizontally and movably installed on a horizontal guide rail, and an included angle is formed between the binary optical diffraction element and the horizontal plane; the electrical control module is used for controlling the binary optical diffraction element to move at set movement speed and by the included angle. The realization system for laser speckle restraining based on the optical diffraction element is good in speckle restraining effect, simple in structure, easy in realization, good in generality and robustness and low in cost.

Description

technical field [0001] The invention belongs to the field of laser display projection, and in particular relates to a system for realizing speckle suppression. Background technique [0002] Laser speckle is a layer of granular structure observed on the surface of rough objects when a diffuser is illuminated with laser light. The essence of speckle is a random coherent superposition. Speckle is noise in imaging and information images, and usually seriously affects the quality of images and information. Therefore, speckle suppression is required in laser systems, especially laser display projection systems. [0003] Due to the importance of speckle suppression, predecessors have carried out a lot of theoretical research. The theoretical methods of speckle suppression in optical projection that have been proposed can be roughly divided into 8 types: 1. Introduce polarization diversity; 2. Introduce a moving screen ; 3. Introduce a specially designed screen to minimize the spe...

AI Technical Summary

Problems solved by technology

[0005] In order to overcome the shortcomings of the existing speckle suppression technology and system structure, high experimental precision requirements, difficult implementation, poor system fault tolerance, robustness, versatility, and insufficient speckle suppression effect, the present invention provides a speckle suppression Realization system of laser speckle suppression based on optical diffraction element with good effect, simple structure, easy implementation, system versatility, good robustness and low cost

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