Optical engineers have developed a novel automated design method for creating advanced freeform optical systems. This new approach streamlines the complex process of designing these systems, which are crucial for high-performance imaging applications.
The method begins by generating a range of traditional coaxial spherical lens configurations as a starting point. In the first phase, these configurations are systematically varied based on optical path distributions. Mathematical formulas are employed to calculate key parameters of these systems, such as curvature radii and surface distances, laying the foundation for further design modifications.
Moving beyond conventional designs, the second phase introduces innovative structural changes. Each optical surface within the initial coaxial systems is deliberately tilted and repositioned. This transformation leads to the creation of non-coaxial systems with diverse configurations, including off-axis designs. This step is crucial for exploring a broader design space and creates systems tailored for specific performance requirements.
The third phase marks a shift to freeform optics. Building upon the non-coaxial systems generated, the optical surfaces are reshaped into complex freeform surfaces. This is achieved using a point-by-point construction method, carefully adjusting surface shapes to correct for optical path differences introduced in the previous tilting phase. By employing polynomial functions to represent these intricate surfaces, this ensures the system maintains high optical performance.
To further refine the designs, the fourth phase focuses on enhancing image quality. An iterative optimization process is applied, repeatedly adjusting the freeform surfaces based on ray tracing analysis. This method ensures continuous improvement of the image quality. Furthermore, the image plane itself is also finely adjusted for optimal tilt, maximizing the final image sharpness.
In the final phase, the performance of each designed system is rigorously evaluated using industry-standard metrics such as spot size, modulation transfer function, and wavefront error. Only the designs meeting stringent quality criteria are presented as final outputs, allowing optical designers to select the most suitable solution for their specific application. This automated method promises to significantly accelerate the design process for sophisticated freeform optical systems and expand the possibilities for advanced optical technologies.
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