Shimming and speckle suppression device

Abstract

The invention provides a laser beam shimming and speckle restraining device. The device comprises a circular truncated cone-shaped optical wand, a motor, a wedge-shaped scattering disc and a pyramid frustum-shaped light pipe. According to the device, the circular truncated cone-shaped optical wand receives incident beams which shine out as an annular facula at the outgoing end after being reflected repeatedly in the optical wand, and the outgoing beams are scattered through the scattering disc driven by the motor, shine onto the incident end of the pyramid frustum-shaped light pipe as annular incident light, reshaped to be rectangular after being reflected repeatedly in the light pipe, and then shine out through the outgoing end of the light pipe. The device is simple in structure, stable in operation, good in speckle eliminating effect, and even in optical field and can be applied to the lighting or displaying technical field with coherent light as the light source.

Description

technical field [0001] The invention relates to the technical field of laser display, in particular to an optical instrument applied to laser illumination, laser exposure and coherent light as a light source, in particular to a shimming and speckle suppression device. Background technique [0002] Laser has the characteristics of high brightness, small wavelength bandwidth, and small etendue, and has broad application prospects in the field of laser display and laser lighting. However, since the laser emits a single-mode or multi-mode Gaussian beam, the distribution of the light field is not uniform, so it is necessary to convert the laser beam into a beam with a specific shape (such as a rectangle or a square) and a uniform intensity; since the laser is coherent light, after rough After the surface (such as a screen) is reflected, the human eye sees an image with speckle, which seriously reduces the image display quality, so it is necessary to eliminate laser speckle phenom...

AI Technical Summary

Problems solved by technology

However, since the laser emits a single-mode or multi-mode Gaussian beam, the distribution of the light field is not uniform, so it is necessary to convert the laser beam into a beam with a specific shape (such as a rectangle or a square) and a uniform intensity; since the laser is coherent light, after rough After the surface (such as a screen) is reflected, the human eye sees an image with speckle, which seriously reduces the image display quality, so it is necessary to eliminate laser speckle phenomenon, improve image quality, shimming of laser beam and speckle elimination Become the two major problems in the field of laser display and laser lighting

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