Optical systems and laser cutting equipment

Abstract

This application provides an optical system and a laser cutting device. The system includes a first focusing lens, a concave lens, and a focusing lens group arranged coaxially along a first direction. The first direction is the initial transmission direction of the light emitted by the target light source. The optical axis of the first focusing lens passes through the virtual focal point of the target light source. The virtual focal point is the point where the reverse rays of the light emitted by the target light source converge. The distance between the first focusing lens and the virtual focal point of the target light source is greater than the focal length of the first focusing lens. The concave lens is configured to change the distance between itself and the first focusing lens to adjust the aberration of the light emitted by the target light source. As the distance between the first focusing lens and the concave lens in the collimating lens group changes from far to near, the optical system exhibits the following trends: negative defocus beam convergence and tending towards a flat top, positive defocus dispersion and tending towards Gaussianization, then the distribution of positive and negative defocus beams becomes equal, and finally, negative defocus dispersion and tending towards Gaussianization, and positive defocus beam convergence and tending towards a flat top.

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