Large-angle high-magnification zooming laser illumination lens

Abstract

The invention discloses a wide-angle high-magnification zoom laser illumination lens, which comprises an optical fiber coupling output laser, a first lens and a second lens which are sequentially arranged along the optical axis direction of the optical fiber coupling output laser, and the distance between the first lens and the optical fiber coupling output laser is fixed. The second lens moves away from or close to the first lens in the optical axis direction to achieve zoom illumination, and the distance between the first lens and the optical fiber coupling output laser is larger than two times of the focal length f1 of the first lens. According to the invention, the structure is simple, coaxial alignment is easy, large-angle high-magnification zoom illumination is realized through the two groups of lenses, the overall transmittance of laser is increased, the processing and assembling cost is reduced, large-angle uniform zoom illumination can be realized by moving the second lens, the maximum illumination angle is greater than 40 degrees, and uniform correction of light spots and large-angle zoom illumination are realized.

Description

technical field [0001] The invention belongs to the technical field of laser lighting, and particularly relates to a large-angle and high-magnification zoom laser lighting lens. Background technique [0002] The light spot output by the existing fiber-coupled semiconductor laser is such as figure 1 As shown in the figure, the spot energy distribution is not uniform, which cannot meet the requirements of illumination uniformity. Due to the limitation of the numerical aperture of the optical fiber, the angle of the laser spot is generally around 20°, which cannot meet the requirements for the angle of illumination, such as figure 2 The simple 2-piece lens combination shown can increase the laser illumination angle, but it cannot correct the uneven distribution of laser spot energy density. The center and edge parts of the spot have high energy density, and other parts have low energy density, which seriously affects the illumination. Effect, more than 4 pieces (groups) of zo...

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Problems solved by technology

[0002] The output spot of the existing fiber-coupled semiconductor laser is as follows: figure 1 As shown, the energy distribution of the spot is not uniform, which cannot meet the uniformity requirements of the illumination. Due to the limitation of the numerical aperture of the optical fiber, the angle of the laser spot is generally about 20°, which cannot meet the requirements for the angle of the illumination, such as figure 2 The simple 2-piece lens combination shown can increase the laser illumination angle, but it cannot correct the problem of uneven energy density distribution of the laser spot. There will be high energy density in the center and edge of the spot, and low energy density in other parts, which seriously affects the illumination. As a result, zoom lenses with more than 4 pieces (groups) can achieve uniform illumination of the spot. By moving one or two lenses, zoom lighting can be realized. More lenses are not conducive to coaxial alignment, which increases the difficulty of assembly and complex structure. Improve the assembly difficulty of the mechanical structure and the coaxial alignment of the laser spot, increase the reflection power loss of the laser, which is not conducive to practical application

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