Homogenization method and device for a fiber-coupled semiconductor laser
A technology of semiconductors and lasers, applied in the coupling of optical waveguides, optics, instruments, etc., can solve problems such as unevenness, laser speckle light and dark interlaced brightness, uneven optical power distribution, etc., and achieve the effect of simple structure and stable operation
Active Publication Date: 2016-05-04
FOCUSLIGHT TECH
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[0006] Aiming at the problems of uneven distribution of optical power in the output beam of fiber-coupled semiconductor lasers, the present invention proposes a method for homogenizing the output spot of fiber-coupled semiconductor lasers and a corresponding semiconductor laser system capable of outputting homogenized spots, which can solve problems caused by laser The defect of laser speckle (that is, the uneven brightness of light and dark on the light projection surface) appears in night video images brought about by high coherence, which makes the image clearer and completely eliminates laser speckle
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[0029] Below in conjunction with accompanying drawing, describe the present invention in detail through embodiment.
[0030] Fiber-coupled semiconductor laser homogenization method of the present invention, such as figure 1 As shown, after the semiconductor laser 1 is output through the fiber jumper 2 with a numerical aperture of NA, a homogenizer 5 is set at a distance from the laser output end L, wherein the homogenizer 5 is at a distance from the light output end ( figure 1 The middle is the end of the fiber jumper 2), the distance L is not greater than d / 2tan (arcsinNA), and d is the width of the homogenizer.
[0031] The semiconductor laser 1 can be a single-tube semiconductor laser, a bar semiconductor laser, or multiple single-tube semiconductor lasers.
[0032] The specific form of the homogenizer can be microlens array, Fresnel lens, optical waveguide, frosted glass, etc. The optical waveguide is preferably a multi-rib optical waveguide, which can be hollow or solid...
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The invention provides an optical fiber coupling semiconductor laser unit homogenizing method for outputting light spots and a corresponding semiconductor laser unit system which can output homogenized light spots. The semiconductor laser unit system comprises a semiconductor laser unit, an optical fiber patch cord, an output connector and a homogenizing device, wherein the semiconductor laser unit, the optical fiber patch cord, the output connector and the homogenizing device are sequentially connected, the output end of the optical fiber patch cord is connected with fixed at the light receiving end of the output connector, the homogenizing device comprises a casing pipe and a homogenizer which is installed at the tail end of the casing pipe, the front end of the casing pipe is fixedly connected to a metal inserting core of the output connector in a sleeved mode, the casing pipe is a hollow type casing pipe, in a cavity of the hollow type casing pipe, the distance L between the light projecting end of the output connector and the homogenizer is not more than d / 2tan (arcsinNA), d is the width of the homogenizer, and NA is a numerical aperture of the optical fiber patch cord. The optical fiber coupling semiconductor laser unit homogenizing device is simple and clear in structure, stable in operation, reliable, capable of producing the even light spots with suitable sizes and suitable luminance.
Description
technical field [0001] The invention belongs to the field of laser manufacturing, and relates to laser homogenization technology, in particular to a semiconductor laser homogenization method and device applicable to night vision lighting. Background technique [0002] At present, laser night vision devices are widely used in border defense, military, public security, cultural relics, bases, oil fields, industrial and mining, factory areas, fishing grounds, forest farms, orchards and other places and fields. [0003] The laser is an important part of the laser night vision device. The quality of its design directly determines the performance of the entire night vision device. Traditional night vision lighting lasers generally have the disadvantages of complex structure, large volume and large loss of laser power. [0004] 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 ma...
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IPC IPC(8): G02B27/09G02B6/42
Inventor 贺永贵蔡万绍杨凯刘兴胜赵炎武刘鑫
Owner FOCUSLIGHT TECH