Polychromatic Laser Focal Line for Selective Glass Processing Depth
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Solution Overview
Problem
Existing methods for processing workpieces, particularly those made of glass or glass ceramic, using pulsed laser beams struggle with achieving selective and accurate control over processing depth and often result in inhomogeneous intensity distributions and fracture surfaces.
Innovation Solution
A device and method utilizing a pulsed polychromatic laser beam with an optical arrangement having chromatic aberration for wavelength-dependent focusing and at least one filter for wavelength-dependent filtering, allowing for selective adjustment of processing depth by generating a focal line along the laser beam direction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a pulsed laser beam is used for processing workpieces, then material modification and separation can be achieved, but the processing depth cannot be selectively and accurately controlled
Solution Approach 1:
The patent applies parameter changes by utilizing the wavelength-dependent focusing property of the optical arrangement. Different wavelengths of the polychromatic laser beam are focused at different depths within the workpiece, enabling selective control of processing depth through wavelength selection. This resolves the contradiction by providing both accurate depth control and ease of selective adjustment through wavelength parameter variation.
Solution Approach 2:
The patent introduces a new dimension of control by adding the wavelength parameter to the laser beam. Instead of controlling processing depth through a single parameter, the system uses the spectral dimension of polychromatic light, where each wavelength component contributes to processing at a specific depth, thereby achieving selective and accurate depth control.
2Manufacturing precision
If conventional optical arrangements are used for laser beam focusing, then a focal point is achieved, but an inhomogeneous intensity distribution is created along the processing line
Solution Approach 1:
The patent applies local quality by creating a focal line instead of a focal point, where different regions along the beam direction receive optimized intensity distribution. The optical arrangement with chromatic aberration ensures that each wavelength component is focused at a specific position along the focal line, creating a more homogeneous overall intensity distribution while maintaining local processing precision.
3Manufacturing precision
If self-focusing and plasma defocusing equilibria are used to form filaments, then submicrometer microchannels can be created, but the setup becomes complicated and difficult to adjust
Solution Approach 1:
The patent extracts the focusing function from the complex self-focusing and plasma defocusing equilibrium process. By using an optical arrangement with chromatic aberration, the system directly creates a focal line through wavelength-dependent focusing, eliminating the need to balance nonlinear self-focusing effects with plasma defocusing effects. This simplifies the setup while maintaining the ability to create precise microchannels.
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
The solution enables precise and selective adjustment of processing depth in workpieces, improving the accuracy and reproducibility of separating workpieces along a predetermined processing line, resulting in high-quality fracture surfaces.
Implementation Method 1
an optical arrangement (6) having chromatic aberration for wavelength-dependent focusing of the laser beam (5)
Implementation Method 2
having at least one filter (7) for wavelength-dependent filtering of the laser beam (5)
Implementation Method 3
By using the Kerr effect, with a sufficiently high intensity of a laser beam, for a nonlinear interaction between the electromagnetic field of the laser beam and a workpiece, self-focusing of the laser beam takes place
Implementation Method 4
Because of the high intensity at the focus, a plasma is created in the workpiece, which has a defocusing effect on the laser beam
Data Source
AI summary
Devices and methods for processing a workpiece along a predetermined processing line are provided. The device includes: a pulsed, polychromatic laser beam generator; an optical arrangement; and a moving device. The laser beam generator generates a laser beam along a beam direction. The optical arrangement generates a focal line along the beam direction. The optical arrangement has a chromatic aberration for wavelength-dependent focusing of the laser beam and a filter for wavelength-dependent filtering of the laser beam. The moving device generates relative movement between the laser beam and the workpiece along the predetermined processing line.