Method for establishing laser source model for femtosecond laser ablation simulation

Abstract

The invention provides a method for establishing a laser source model for femtosecond laser ablation simulation, which provides a laser source model with a focus moving down according to a spatial andtemporal distribution of the laser,. According to the method for establishing laser source model for femtosecond laser ablation simulation, the proposed laser source three-dimensional model can describe the situation in which the laser focus moves down with the material removal during the actual machining process, , it is ensured that the laser energy density above the material surface is realistic by dividing the expression into two segments at the machining plane position as shown in the description, and the energy density below the material surface (i.e., inside of the material) is reasonably attenuated. The proposed laser source three-dimensional model can also describe the spiral motion of the laser focus on the material plane during actual machining.

Description

technical field [0001] The invention belongs to a method for establishing a laser source model, in particular to a method for establishing a laser source model for femtosecond laser ablation simulation. Background technique [0002] In numerical simulation, the mathematical description of the laser source item will directly affect the absorption of laser energy by the material. The currently widely used laser source model can only be used for drilling holes in materials with extremely small thickness (thickness is smaller than the spot radius) such as metal films. simulation, and ignores the Gaussian distribution of laser energy density on the spot plane, which cannot accurately simulate the ablation situation in the actual drilling process; some laser models cannot be used for the simulation of laser helical drilling; The laser drilling process with focus down is simulated. Contents of the invention [0003] In order to solve the above technical problems, the present inv...

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Problems solved by technology

[0002] In numerical simulation, the mathematical description of the laser source item will directly affect the absorption of laser energy by the material. The currently widely used laser source model can only be used for drilling holes in materials with extremely small thickness (thickness is smaller than the spot radius) such as metal films. simulation, and ignores the Gaussian distribution of laser energy density on the spot plane, which cannot accurately simulate the ablation situation in the actual drilling process; some laser models cannot be used for the simulation of laser helical drilling; Simulation of laser drilling process with focus down

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