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A method for establishing a laser source model for femtosecond laser ablation simulation

A technology of femtosecond laser and establishment method, which is applied in the direction of design optimization/simulation, special data processing application, etc. It can solve problems such as unusable laser model, ignoring the Gaussian distribution of laser energy density, and laser helical drilling simulation.

Active Publication Date: 2021-06-15
XIAMEN UNIV +1
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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 laser source model widely used at present 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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  • A method for establishing a laser source model for femtosecond laser ablation simulation
  • A method for establishing a laser source model for femtosecond laser ablation simulation
  • A method for establishing a laser source model for femtosecond laser ablation simulation

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Embodiment Construction

[0032] A method for establishing a laser source model for femtosecond laser ablation simulation in this embodiment is characterized in that:

[0033] The first step is to establish a Cartesian coordinate system in the initial state of the laser source model, with the initial processing surface as the xoy plane, the laser transmission direction as the positive direction of the z-axis, and the center of the laser focus as the origin of the coordinate system;

[0034] In the second step, according to the Gaussian distribution of laser energy in space, the expression of laser distribution in space is established:

[0035]

[0036] Where: R is the reflectivity, δ is the optical penetration depth of the material, δ b is the electron ballistic length, J is the laser single pulse energy, Z s is the position of the machining plane, ω d (z,t) is the beam transmission equation with focus down, and its expression is:

[0037]

[0038] In the formula: v is the moving speed of the ...

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Abstract

The invention provides a method for establishing a laser source model for femtosecond laser ablation simulation. According to the distribution of laser light in space and time, a laser source model with a downward focus is obtained. The proposed three-dimensional model of the laser source can be Describe the situation that the laser focus moves down with material removal in the actual processing process. By dividing the expression into two sections at the position of the processing plane ( ), it is ensured that the laser energy density above the material surface is in line with reality, and in the material The energy density below the surface (i.e. inside the material) is reasonably attenuated, and the proposed 3D model of the laser source can also describe the helical movement of the laser focus on the material plane during actual processing.

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...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F30/20
CPCG06F30/20
Inventor 董一巍李效基尤延铖王尔泰吴宗璞曲文慧殷春平
Owner XIAMEN UNIV
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