A self-focusing laser processing device

Abstract

The invention relates to a self-focusing laser processing device. A container for containing a non-linear medium is fixed between a lens and a workbench by the aid of a clamping mechanism. A laser beam is focused on the surface of the non-linear medium, the laser beam focused by the lens enters the non-linear medium to be transferred to produce self-focusing, and through two times of focusing by the lens and the non-linear medium, the laser beam leaving the container has the extremely small diameter and is linearly spread to the surface of a workpiece. The depth of the non-linear medium in the container, that is, the self-focusing distance L is related to energy of the laser beam and the refractive index of the adopted non-linear medium. A water jet auxiliary device is also provided, and the laser focus point on the surface of the workpiece coincides with the jet injection point center. Impact of water jet on the surface of the workpiece carries away residues and heat removed by laser. Lens focusing and self-focusing are combined, almost half of the diameter of the laser beam is reduced, and the energy density of the laser beam is increased. Laser alignment transfer is realized after self-focusing, the divergence angle is small, longitudinal etching is facilitated, the processing depth is increased, and the etching accuracy and efficiency are guaranteed.

Description

technical field [0001] The invention relates to the technical field of laser processing, in particular to a self-focusing laser processing device. Background technique [0002] Laser processing is an important technology in the field of micromachining. It has the advantages of high-speed and precise cutting of materials and no tool wear. It has been used in different fields as a very effective fine processing method. [0003] During laser processing, the size of the spot at the laser focus is an important parameter that affects the processing quality. In traditional laser processing, laser light is converged by a focusing lens to form a focal point, and the workpiece is processed near the focal point. The smaller the laser focus spot, the more precise the processed parts can be obtained. [0004] Generally, when laser processing starts, the laser is focused on the surface of the workpiece. However, as the laser etches from the surface of the workpiece to the depth, the ab...

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Problems solved by technology

[0007] However, it is difficult to achieve the laser beam focusing required for laser processing only by relying on the self-focusing effect, and it is also difficult to achieve the final focusing requirements.

Therefore, laser processing equipment using self-focusing media has not yet appeared in the market

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