Green light laser zooming and beam expanding system and laser processing device

Abstract

The invention is suitable for the field of laser processing, and provides a green light laser zooming and beam expanding system comprising a first lens, a second lens and a third lens. The first lens and the third lens present to be plane-convex positive lenses. The second lens presents to be a convex-concave negative lens. The first lens, the second lens and the third lens respectively comprise a first curved surface and a second curved surface, a third curved surface and a fourth curved surface, and a fifth curved surface and a sixth curved surface. Curvature radiuses of the first to the sixth curved surfaces are indefinite, -29.8, 7.2, 1.6, indefinite and -100. Center thicknesses of the first to the third lenses are 2, 1 and 4. External diameters of the first to the third lenses are 10, 3 and 34. Ratios of refractive indexes to abbe numbers of the first to the third lenses are 1.8:25, 1.48:68 and 1.8:25. Spacing distance between the second curved surface and the third curved surface is from 8 to 28mm, spacing distance between the fourth curved surface and the fifth curved surface is from 107 to 115mm, and tolerance is 5%. Beams of incident light can be expanded for 2 to 16 times by the system so that the system is applicable to lasers with different emergent diameters and divergence angles, and efficiency and accuracy of laser processing are enhanced.

Description

technical field [0001] The invention belongs to the technical field of laser processing, and in particular relates to a green laser laser beam expanding system with variable magnification and laser processing equipment. Background technique [0002] In the field of laser processing, the output diameter Φ of the laser beam is very small (about 1mm). If such a thin beam is directly focused, its Rayleigh spot will be very large. According to the Rayleigh spot formula: δ=2.44λf / D, where δ is the diameter of the Rayleigh spot, D is the diameter of the entrance pupil of the focusing mirror, and f is the focal length. It can be seen that the smaller D is and the larger δ is, the weaker the energy of the focal point will be, which will greatly reduce the processing accuracy of the system. Therefore, the optical system used for laser processing is generally equipped with a beam expander, which expands the beam from the laser, and then focuses it on the laser processing focusing lens...

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a green laser laser variable magnification beam expansion system, which aims to solve the problem of limited beam expansion ability and small adaptable range of existing beam expanders

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