Distributed Flux Array Using Split Beams to Protect OALVs
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Solution Overview
Problem
Existing optically addressable light valves (OALVs) fail to withstand high fluence laser sources required for industrial metal additive manufacturing, leading to premature damage and inability to achieve the necessary tens of millions to billions of build cycles.
Innovation Solution
A system is developed to split and combine incoming illumination beams using optics such as lenses, prisms, diffractive optics, and holographic optics, and superimpose or overlay images on multiple optically addressable light valves to form a single or distributed image at the build plane, minimizing laser damage through beam manipulation and control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If high fluence laser sources are used to increase processing energy density, then productivity and manufacturing speed are improved, but the optically addressable light valves suffer premature damage and reduced durability
Solution Approach 1:
The patent divides the single high-fluence laser beam into multiple lower-fluence beams using optical elements (beam splitters, diffractive optical elements, or lens arrays). Each beam is directed to a different region of the light valve, segmenting the total energy delivery. This allows the light valve to process material at high overall fluence while each local region experiences reduced fluence that prevents damage, thereby improving both productivity and reliability.
Solution Approach 2:
The patent introduces optical intermediaries (beam splitters, diffractive optical elements, lens arrays) between the laser source and the light valve. These intermediaries mediate the energy transfer by redistributing the laser fluence across multiple spatial locations on the light valve surface. This intermediary approach enables high processing energy while protecting the light valve from direct high-fluence damage.
2Reliability
If the energy density at the optically addressable light valves is reduced to prevent damage, then the light valve durability is improved, but the processing time increases and productivity decreases
Solution Approach 1:
The patent segments the light valve surface into multiple regions that can simultaneously receive lower-fluence beams. By parallel processing multiple regions at once, the system maintains high overall processing throughput (productivity) while each region experiences reduced fluence that extends light valve lifetime (reliability). This resolves the contradiction by making the fluence reduction spatial rather than temporal.
Solution Approach 2:
The patent transitions from a single-point fluence delivery approach to a multi-point spatial distribution approach. Instead of delivering high fluence at a single location (which damages the light valve), the system distributes energy across multiple spatial dimensions on the light valve surface. This dimensional expansion allows parallel processing at lower fluence levels, maintaining productivity while improving durability.
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 system enhances the durability of OALVs, allowing them to withstand high fluence laser sources, thereby increasing the number of build cycles and improving the efficiency and reliability of metal additive manufacturing processes.
Implementation Method 1
A system is developed to split and combine incoming illumination beams using optics such as lenses, prisms, diffractive optics, and holographic optics
Implementation Method 2
superimpose or overlay images on multiple optically addressable light valves to form a single or distributed image
Implementation Method 3
minimizing laser damage through beam manipulation and control
Implementation Method 4
minimizing laser damage through beam manipulation and control
Data Source
AI summary
An apparatus includes at least one laser source and a print bed. A light valve array having at least three optically addressable light valves is positioned to direct differing images at the print bed. Optics to direct multiple beams derived from the at least one laser source can be positioned to direct light toward and from the optically addressable light valves.