Laser Pulse Distribution Control for Low-Roughness Ablation
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Solution Overview
Problem
Current laser-based processing technologies face challenges in achieving low surface roughness after ablative material removal, despite optimizations in power distribution and energy fluence, resulting in surfaces with excessive roughness for certain specifications.
Innovation Solution
A processing apparatus and method that utilize a control device to adjust the pulse distribution profile of laser pulses, applying a deconvolution operation with the laser pulse cross-sectional profile as a point spread function to transform the processing volume into a deconvoluted volume, and then convert it back into a pulse distribution profile to guide laser pulses with precise intensity distribution for optimal material removal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If laser pulses are used for ablative removal of material, then material can be removed from the object, but the surface roughness becomes too high for some specifications
Solution Approach 1:
The patent applies parameter changes by transforming the desired processing volume through a deconvolution operation using the laser pulse cross-sectional profile as a point spread function. This mathematical transformation calculates an optimized pulse distribution that accounts for the laser's inherent spreading characteristics, enabling precise control over the ablated volume and resulting surface roughness while maintaining effective material removal
Solution Approach 2:
The patent employs preliminary action by pre-calculating the pulse distribution profile through deconvolution before actual laser processing. This preliminary computational step determines the exact positions and intensities of laser pulses needed to achieve the desired processing volume, allowing the system to compensate for laser spreading effects in advance and produce smooth surfaces with precise material removal
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach effectively reduces surface roughness by ensuring precise control over laser pulse placement and intensity, aligning with the desired processing volume, thereby improving the smoothness of processed surfaces.
Implementation Method 1
processing apparatus for processing an object by means of laser pulses... configured to process the object to remove a processing volume from the object by means of laser pulses
Data Source
AI summary
The invention relates to a processing apparatus (1) for processing an object (9) by means of laser pulses (3), which at least comprises:at least one laser beam source (2) configured for the emission of laser pulses (3), at least one beam exit device (4), which is configured to guide the respective laser pulses (3) with a predetermined laser pulse cross-sectional profile according to a pulse distribution profile (11) in a processing area (7) of a preset processing volume (8) of an object (9) to be processed, and a control device (10), which is configured to ascertain the pulse distribution profile (11) in the processing area (7) according to a predetermined pulse distribution ascertaining method for the preset processing volume (8) and the predetermined laser pulse cross-sectional profile. It is provided that the control device (10) is configured to transform the preset processing volume (8) into a deconvoluted processing volume (15) according to a predetermined deconvolution operation (F2) with the laser pulse cross-sectional profile as a point spread function of the deconvolution operation (F2), and to transform the deconvoluted processing volume (8) into the pulse distribution profile (11) by means of a predetermined conversion function (F5), in the predetermined pulse distribution ascertaining method.