Beam expanding device of high-power semiconductor laser unit

Abstract

The invention provides a beam expanding device of a high-power semiconductor laser unit. The beam expanding device can achieve beam expansion of high magnifying power, and is simple and compact in structure, small in size and low in cost. The beam expanding device comprises a semiconductor laser unit stack, a collimating lens set and a beam splitting system which are sequentially arranged along a light path. The beam splitting system comprises n beam splitting lenses and a total reflection mirror, wherein the n beam splitting lenses are arranged sequentially in the stacking height direction of the semiconductor laser unit stack, the total reflection mirror is finally arranged, the first beam splitting lens is equivalent to the stacking height of the semiconductor laser unit stack, the n beam splitting lenses and the total reflection mirror are arranged in parallel and at equal intervals, and the angle between the direction of the lenses and the light emitting-out direction of the semiconductor laser unit stack ranges from 30 degrees to 60 degrees; the transmission light of the first beam splitting lens, the reflected light of the other (n-1) first beam splitting lenses and the reflected light of the total reflection mirror form laser expanded beams together; as the n beam splitting lenses are different in light transmissivity, the energy of the transmission light of the first beam splitting lens is equal to the energy of the reflected light of the other (n-1) first beam splitting lenses and the energy of the reflected light of the total reflection mirror.

Description

technical field [0001] The invention belongs to the field of laser applications, in particular to a laser beam expander of a high-power semiconductor laser. Background technique [0002] Laser has the advantages of good monochromaticity, good directionality, good coherence and high brightness, and has been widely used in various fields of national economy. The diameter of the beam emitted by the laser is very small, usually 1-2mm. In some specific applications, such as laser processing, laser detection and laser lighting, it is necessary to use a larger diameter laser beam, which requires a beam expander system to achieve . In laser processing applications, in order to improve processing efficiency, it is necessary to use a beam expander system to increase the laser spot; in laser lighting applications, the laser spot is required to be large and uniform, and the beam expander system is required to expand the spot diameter before using it as a light source. The laser beam e...

AI Technical Summary

Problems solved by technology

Due to the constraints of the above factors, this kind of beam expansion system is not suitable for large-magnification beam expansion, which will cause the system to be bulky and inconvenient to use, and the processing material of the lens is generally glass, and the cost of making a large-magnification beam expansion lens is relatively high.

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