Homogenizing method for laser illumination and laser illumination device

Abstract

Disclosed are a homogenization method for laser lighting supplementation and a laser illumination device thereof. The device includes a semiconductor laser (110), a homogenization device (120) and a lens set (130). The semiconductor laser (110) is used for emitting laser irradiation. The homogenization device (120) is used for homogenizing the energy distribution on the vertical plane in the laser propagation direction. The lens set (130) at least includes a beam expansion lens (131) and a focusing lens (132) which are used for expanding and focusing the laser irradiation. Also provided is a vibration or rotation device (140) which is used for allowing at least two of the semiconductor laser (110), homogenization device (120) and lens set (130) to vibrate or rotate relatively, and the vibration or rotation period thereof is less than or equal to the electronic snapshot time of a camera. The homogenization method for laser lighting supplementation and laser illumination device thereof in the present invention realize elimination of light and shade strips in the images and the laser speckle phenomena in the images due to the utilization of the vibration or rotation homogenization method and laser illumination device.

Description

technical field [0001] The invention relates to an image acquisition system and method, in particular to a method for homogenizing laser supplementary light in the process of infrared laser imaging and the improvement of the laser lighting device. Background technique [0002] In the prior art, with the development of night camera technology, the requirements for infrared laser supplementary light (or called infrared laser lighting) are getting higher and higher. At present, most of the semiconductor laser illuminator is used for infrared camera supplementary light in the market. [0003] Due to the defect of uneven light energy distribution in semiconductor lasers, various types of beam splitters or optical fibers are commonly used in the market to homogenize the laser beam. However, due to the high coherence of the laser itself, although all the above homogenization methods or devices will eliminate There are some light and dark stripes in the image, but all of them will p...

AI Technical Summary

Problems solved by technology

[0005] The object of the present invention is to provide a homogenization method for laser supplementary light and its laser lighting device, which can solve the problem of laser speckle (that is, the interlaced brightness of light and dark on the light projection surface) caused by the high coherence of laser. Inhomogeneity) defects, make the image clearer, and can completely eliminate laser speckle

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