Device for eliminating laser speckles and preparation method thereof

Abstract

The invention provides a device for eliminating laser speckles and a preparation method thereof. The device has the advantages of simple structure and low implementation cost. The device comprises multiple input optical fibers and an output optical fiber. One ends of the multiple input optical fibers integrally form a thin cone-shaped optical waveguide through a melt fiber fine-drawing process, and the output optical fiber is fusion-welded to the conical end of the optical waveguide. The device has a very good speckle eliminating effect, and has the advantages of simple and clear structure, simple process, low cost, and high reliability. The whole device is small in size, and has a large space for power upgrading. The input end is more flexible, and is easy to match a variety of input modes and objects. The device can be widely applied to infrared monitoring, laser projectors, and the like.

Description

technical field [0001] The invention relates to a method and device for reducing or even eliminating laser speckles. Background technique [0002] Semiconductor lasers have the advantages of small size, light weight, high electro-optical conversion efficiency, high reliability and long life, and have obvious advantages in laser display, security equipment, night vision lighting and other industrial applications. When used in laser display, night vision lighting and other industries, there are high requirements on the degree of speckle of the output laser. If the speckle is too serious, it will directly affect the display resolution. At present, there are mainly two types of laser speckle elimination methods in the market: [0003] 1) The multi-beam synthesis method is adopted. Chinese patent CN104777626A discloses a device for suppressing laser speckle, which suppresses laser speckle by means of multi-fiber bundles. The device uses physical beam combining to reduce the coh...

AI Technical Summary

Problems solved by technology

Chinese patent CN104777626A discloses a device for suppressing laser speckle, which suppresses laser speckle by means of multi-fiber bundles. The device uses physical beam combining to reduce the coherence of the laser itself, although it can suppress laser speckle, but In the actual application, the suppression effect achieved is far from the ideal effect;

[0004] 2) It is realized by rotating array mirror or device shaking, such as rotating ground glass, polygonal prism or sieve, but this method is expensive and complex to implement, so the actual application is very limited

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