Adjustable Mirrors for Laser Beam Alignment
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Solution Overview
Problem
Conventional laser machining devices face issues with laser beam aberration due to fluctuations in laser light sources and spatial light modulators, leading to inaccurate convergence of the laser beam onto the object being machined.
Innovation Solution
The introduction of a laser machining device with adjustable mirrors between the laser light source and spatial light modulator, and an adjustment optical system with dichroic mirrors, ensures precise alignment and incidence of the laser beam, minimizing aberration and astigmatism, and utilizing a 4f optical system to regulate the wavefront and beam diameter.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional laser light sources and reflective spatial light modulators are used without adjustment mechanisms, then the device structure is simple, but the laser beam cannot be made incident precisely on the spatial light modulator due to fluctuations, causing increased aberration
Solution Approach 1:
The patent introduces adjustable mirrors (first mirrors and second mirrors) that can dynamically change the direction of reflection of the laser beam. This allows the optical system to adapt to fluctuations in laser light sources and spatial light modulators, enabling precise control of the laser beam's incident position and angle on the spatial light modulator, thereby resolving the technical contradiction between manufacturing precision and device complexity.
2Reliability
If the laser beam is made incident precisely on the spatial light modulator using adjustment mechanisms, then aberration is suppressed, but the device complexity increases due to additional mirrors and adjustment systems
Solution Approach 1:
The patent introduces adjustment optical systems as intermediary components between the laser light source and the spatial light modulator. These adjustment optical systems (including first adjustment optical systems and second adjustment optical systems) act as mediators that regulate the laser beam's wavefront form and incident characteristics, enabling precise control while isolating the complexity from the core functional components, thus improving reliability without excessively increasing overall device complexity.
3Manufacturing precision
If multiple adjustment optical systems and mirrors are introduced to control laser beam precision, then aberration and astigmatism are reduced, but the device complexity and alignment difficulty increase
Solution Approach 1:
The patent divides the optical adjustment system into multiple independent segments: first mirrors for initial beam direction control, second mirrors for final incident angle control, first adjustment optical systems for wavefront regulation before the spatial light modulator, and second adjustment optical systems for wavefront regulation after the spatial light modulator. This segmentation allows each component to be independently aligned and adjusted, reducing the overall alignment difficulty despite the increased number of components, thereby achieving high precision in modified region formation.
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 configuration allows for precise control of the laser beam's position and angle, reducing aberration and astigmatism, resulting in improved energy density and functionality of the modified region formed, enhancing the machining process by creating a higher-function cutting start point.
Implementation Method 1
a reflective spatial light modulator for modulating the laser beam emitted from the laser light source
Implementation Method 2
at least two first mirrors for reflecting the laser beam are disposed between the laser light source and the reflective spatial light modulator
Implementation Method 3
at least two second mirrors for reflecting the laser beam are disposed between the reflective spatial light modulator and the adjustment optical system
Implementation Method 4
a dichroic mirror transparent to the laser beam is disposed between the adjustment optical system and the condenser optical system
Implementation Method 5
a condenser optical system for converging the laser beam adjusted by the adjustment optical system into the object
Data Source
AI summary
A laser machining device which can suppress the aberration of a laser beam converged into an object to be machined is provided. The device includes a laser light source for emitting a laser beam and a reflective spatial light modulator for modulating the laser beam emitted from the laser light source (202), while first mirrors for reflecting the laser beam are disposed between the laser light source and reflective spatial light modulator in an optical path of the laser beam and configured such as to be able to adjust the direction of reflection of the laser beam. Therefore, by regulating the direction of reflection of the laser beam at each of the mirrors, the device can adjust the position and incident angle of the laser beam incident on the reflective spatial light modulator as desired. Hence, the laser beam can precisely be made incident on the reflective spatial light modulator.