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《Acta Optica Sinica》 2016-07
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Aberration Properties of Off-Axis Freeform Surface Optical System

Shi Haodong;Zhang Xin;Wang Lingjie;Wang Chao;Jiang Huilin;Institute of Space Optoelectronics Technology,Changchun University of Science and Technology;Key Laboratory of Optical System Advanced Manufacturing Technology,Changchun Institute of Optics,Fine Mechanics and Physics,Chinese Academy of Sciences;  
Based on the vector aberration theory,a method to analyze aberration field distribution induced by the Fringe Zernike polynomial off-axis freeform surface is proposed. The analytical expressions of third-order astigmatism and coma of off-axis freeform surface system are deduced.The aberration nodal distribution of off-axis system caused by the freeform surface is analyzed.According to the aberration distribution properties,with proper Zernike terms selected and optimized,an off-axis two-mirror freeform surface long-wave infrared optical system is designed,and the system has an effective focal length of 500 mm and a pupil diameter of 300 mm.The system is compatible with the uncooled infrared detector that has a format of 384pixel×288pixel,and the pixel size is25μm.The third-order astigmatism and coma nodes of the optimized system are both moved into the field of view,the asymmetric aberration induced by off-axis is balanced,and the imaging quality of the system is close to the diffraction limit that meets application requirements.
【Fund】: 国家自然科学基金(91338116)
【CateGory Index】: O435.2
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