Optical Pattern Generation Device Using Segmented Diffractive Elements
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Solution Overview
Problem
In optical pattern generation devices using two diffractive optical elements, designing the surface irregularity pattern of the second element to account for wavefront changes from the first element is complex and cumbersome.
Innovation Solution
An optical pattern generation device with a first diffractive optical element that changes the phase of laser light based on position, a second diffractive optical element that also changes the phase of incident light, and a transfer optical system to transfer the phase distribution from the first to the second element, allowing for simpler design and manufacturing of the second element.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the surface irregularity pattern of the second diffractive optical element is designed to account for wavefront changes from the first element, then the accuracy of the optical pattern is improved, but the design and manufacturing complexity increases
Solution Approach 1:
The patent divides the optical system into two separate diffractive optical elements with distinct functions. The first DOE handles wavefront correction, while the second DOE generates the final pattern. This segmentation allows each element to be optimized independently, reducing the overall design complexity while maintaining pattern accuracy.
Solution Approach 2:
The first diffractive optical element performs preliminary wavefront correction before the light reaches the second element. By pre-correcting the wavefront, the second element only needs to handle pattern generation without compensating for wavefront distortions, significantly simplifying its design and manufacturing.
2Manufacturing precision
If the surface irregularity pattern of the second diffractive optical element is designed to account for wavefront changes, then the optical pattern accuracy is improved, but the design time and computational resources increase
Solution Approach 1:
The patent divides the optical system into two separate diffractive optical elements with distinct functions. The first DOE handles wavefront correction, while the second DOE generates the final pattern. This segmentation allows each element to be optimized independently, reducing the overall design complexity while maintaining pattern accuracy.
Solution Approach 2:
The first diffractive optical element performs preliminary wavefront correction before the light reaches the second element. By pre-correcting the wavefront, the second element only needs to handle pattern generation without compensating for wavefront distortions, significantly simplifying its design and manufacturing.
Data Source
AI summary
An optical pattern generation device includes: a first laser light source for emitting first laser light; a first diffractive optical element for changing a phase of the first laser light depending on a position on a plane perpendicular to a propagating direction of the first laser light, and emitting laser light having a phase distribution; a second diffractive optical element for changing a phase of incident laser light depending on a position on a plane perpendicular to a propagating direction of the incident laser light, and emitting laser light for forming an optical pattern; and a transfer optical system disposed between the first and second diffractive optical elements, for transferring the phase distribution of the laser light emitted from the first diffractive optical element to a phase distribution of laser light incident on the second diffractive optical element.