Curved Light Sheet Projection for Micron-Scale Two-Photon Printing
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Solution Overview
Problem
Two-photon lithography and other additive manufacturing techniques face challenges in accurately projecting curved surfaces, leading to discretization errors that affect the quality of printed features, particularly on micron-scale depth resolutions.
Innovation Solution
A laser-based manufacturing system that incorporates an optically dispersive element and a phase mask to modify the intensity distribution of the projected light sheet, allowing for the formation of spatially and temporally focused images on curved surfaces by encoding phase information on the phase mask, enabling the projection of non-planar three-dimensional layers with micron-scale depth resolution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional two-photon lithography is used to print curved surfaces, then the manufacturing process can be performed with standard equipment, but discretization errors cause poor surface quality and loss of micron-scale depth resolution
Solution Approach 1:
The phase mask is designed and positioned in advance to pre-correct the wavefront of the light sheet before it reaches the curved surface. This preliminary optical correction ensures that the light converges precisely on the curved target, eliminating discretization errors and achieving micron-scale depth resolution without requiring complex post-processing or adaptive adjustments during printing
Solution Approach 2:
An optically dispersive element is introduced as an intermediary component between the laser source and the curved surface. This element splits the broadband laser beam into multiple wavelength components that can be independently focused, serving as a mediator to achieve precise curvature compensation and maintain manufacturing precision on curved surfaces
2Manufacturing precision
If the light sheet is focused on a curved surface without phase correction, then the optical system remains simple, but the focal points become dispersed and depth resolution is lost
Solution Approach 1:
The phase mask applies localized phase corrections to different regions of the light sheet, with each region's phase modulation tailored to the specific curvature requirements of the target surface. This local quality approach ensures that each portion of the light sheet is precisely focused on its corresponding curved target, maintaining micron-scale depth resolution across the entire curved surface
Solution Approach 2:
The system changes the optical parameters of the light sheet by introducing a phase mask that modifies the wavefront curvature and a dispersive element that separates wavelengths. These parameter changes transform the light sheet from a simple focused beam into a corrected, multi-wavelength focused beam that maintains depth resolution on curved surfaces
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
Enables the precise fabrication of curved surfaces with micron-scale depth resolution, overcoming the limitations of discretization errors in existing systems and improving the quality of printed features.
Implementation Method 1
an optically dispersive element may be configured to receive the laser beam and to split the laser beam into a plurality of distinct beam components, wherein each beam component has spatially separated optical spectral components
Implementation Method 2
a phase mask may be configured to receive at least one of the beam components emerging from the dispersive element
Implementation Method 3
one or more focusing elements configured to receive a modified beam emerging from the phase mask and to focus the modified beam into a non-planar light sheet
Implementation Method 4
a laser for producing a laser beam with a plurality of optical wavelengths
Data Source
AI summary
A laser-based manufacturing system is disclosed for fabricating non-planar three-dimensional layers. The system may have a laser for producing a laser beam with a plurality of optical wavelengths. An optically dispersive element may be used for receiving the laser beam and splitting the beam into a plurality of distinct beam components, wherein each beam component has spatially separated optical spectral components. A phase mask may be used which is configured to receive at least one of the beam components emerging from the dispersive element and to create a modified beam. One or more focusing elements may then be used to receive the modified beam emerging from the phase mask and to focus the modified beam into a non-planar light sheet for use in fabricating a part.