The optical system will always be different from the design value after been processed. It is necessary to adjust the relative positions between the optical elements to improve the imaging quality of the system. However, if the elements are adjusted randomly, the alignment will be inefficient, so the computer-aided alignment method came into being. In this article, for the alignment of large aberration systems, a new fully-connected network computer-aided alignment (Fc-Net CAA) method is proposed. The systems’ wavefront errors (WFEs) are described by the Zernike polynomials which have a huge advantage in describing system aberrations and we proposed a Fc-Net model for predicting systems’ misalignment. The Fc-Net model is trained with the WFEs of thousands of randomly misaligned instances of the lens system that are modeled in the optical design software, so as to establish the relationship between the system aberrations and the amount of misalignment. In this way, the proposed Fc-Net CAA can achieve the computer-aided adjustment process for systems with large aberrations without a complicated iterative process. The off-axis three-mirror system with aspheric surfaces was simulated and adjusted. During the simulation, a single round of adjustment can make the optical system close to the design wave aberration values, and the average of the five field-of-view WFEs is enhanced from 2.4λ (RMS; λ=550nm) to 0.0764 λ (average). The simulation results verify that the improved algorithm can solve the large initial alignment error of the offaxis reflective optical system with aspheric surfaces.
With the improvement of optical lens manufacturing and processing capabilities, the surface shape of optical components is becoming more and more complex, such as asymmetric double-sided off-axis aspheric lenses. Generally, people use two different surface detection equipment to detect this type of optical surface, which is inefficient and not universal. Thus in this paper, we present a dull Compensation method based on Spatial Light Modulator. In this method, we detected an asymmetric double-sided off-axis aspheric mirror with convex and concave surfaces with just one detection equipment. For the concave surface, the residual wave aberration is 0.0002λ (Peak to Valley), for the convex surface, the residual wave aberration is 0.0097λ (Peak to Valley). The result shows that this method is feasible in testing asymmetric double-sided off-axis aspheric lenses.
Small F-number optical system often used in night vision devices. However, in some extreme cases, the common transmission optical system has a certain energy loss and the signal-to-noise ratio of the system is insufficient. In this paper, we design an off-axis three-mirror optical system, which F-number is 1.5, the focal length is 250mm, the field of view is 6°. Considering to reduce the difficulty of processing and adjusting, the primary mirror and third mirror are put on the same lens substrate. The result shows that in a relatively loose tolerance, the MTF of the system is higher than 0.6 at 40 line pairs, which has good imaging quality and meets the design requirements.
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