As a new generation of optical surfaces, free-form surfaces have a non-rotating symmetric structure and complex characterization ability. With the rapid development of optical manufacturing technology and detection technology, it is gradually applied in optical design. But the free surface structure is complex, different optical faces have different surface type features, no good generality. Combining the characteristics of free-form surfaces, proposed the conversion algorithm between different faces and deduced the common surface conversion, presented the use scene and the optical system optimization method, and verified the optical system design examples, proposing new ideas for optical system design. The design results show that the design optimization using the surface conversion algorithm helps to improve the image mass and skip the local minima.
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