Laser Beam Spatial Tailoring via Phase Modulation
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Solution Overview
Problem
Current laser systems for material processing lack efficient and active control over the spatial properties of high power laser beams, particularly in terms of beam width and pulse-to-pulse overlap, which are critical for processing quality and efficiency, especially when using non-moving components at high speeds.
Innovation Solution
A laser system that includes a light generating module, a spectral tailoring module with a phase modulator, and a dispersion module with spatially-dispersive elements to tailor the spectral profile and disperse the light beam, allowing for electronic control of the spatial pattern without mechanical changes, enabling rapid and customizable adjustments to the beam's spatial characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If complex beam scanning and displacement systems are used to control spatial distribution, then the spatial properties of laser beams can be controlled, but the system complexity and mechanical burden increase
Solution Approach 1:
The patent replaces mechanical beam scanning and displacement systems with an electronic control system based on spatial light modulators (SLMs). The SLMs modulate the phase or amplitude of different spatial regions of the laser beam electronically, enabling dynamic control of beam spatial distribution, scanning patterns, and pulse-to-pulse overlap without any mechanical moving parts. This substitution eliminates mechanical complexity while maintaining or enhancing control capabilities.
2Adaptability or versatility
If mechanical moving parts are used for beam control, then spatial pattern changes can be achieved, but the response speed and adaptability to high-speed processing are limited
Solution Approach 1:
The invention substitutes mechanical moving parts with electronically controlled spatial light modulators that can change beam spatial patterns at high speeds. The SLMs are driven by electronic signals that can be updated rapidly, enabling real-time adaptation to high-speed material processing requirements without the inertia and response time limitations of mechanical systems.
Solution Approach 2:
The system implements dynamic control of beam spatial properties through electronic modulation of the SLMs. The spatial distribution, beam shape, and scanning patterns can be changed dynamically by updating the modulation patterns on the SLMs, allowing the system to adapt rapidly to different processing conditions and maintain optimal performance at high speeds.
3Productivity
If fixed optical systems are used, then system simplicity is maintained, but the ability to actively control beam spatial properties at high speed is lost
Solution Approach 1:
The patent introduces electronically controlled spatial light modulators that enable active control of beam spatial properties without requiring complex mechanical reconfiguration. The SLMs can be programmed with different modulation patterns to achieve various beam shapes, scanning patterns, and overlap control, providing high-speed adaptability through electronic control rather than mechanical adjustment.
Solution Approach 2:
The system controls beam spatial properties by changing the modulation parameters of the spatial light modulators. By adjusting the phase or amplitude modulation patterns on the SLMs, the system can dynamically alter beam spatial distribution, effective aperture, and scanning characteristics, enabling high-speed processing with programmable control rather than fixed optical configurations.
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 allows for precise control of the transverse width of light beams and pulse overlap, enabling advanced micromachining with rapid and customizable changes, improving processing efficiency and quality without requiring physical modifications to the optical system or mechanical moving parts.
Implementation Method 1
at least one phase modulator imposing on the input light beam a controllable phase modulation modifying the spectral profile
Implementation Method 2
The dispersion module has at least one spatially-dispersive element, the at least one spatially-dispersive element having dispersion characteristics dispersing the spectrally tailored light beam
Data Source
AI summary
Laser systems and methods for providing an output light beam having a target spatial pattern are provided. A light generating module generates an input light beam, whose spectral profile is then tailored by imposing thereon a controllable phase modulation. The obtained spectrally tailored light beam is dispersed, using at least one spatially-dispersive element to provide an output light beam having a spatial profile which is a function of the spectral profile of the spectrally tailored light beam, The phase modulation is selected in view of the spectral profile of the input light beam and of the dispersion characteristics of the at least one spatially-dispersive element so that the spatial pattern of the output light beam matches the target spatial pattern therefor.