Design of objective lens with reflective spherical Fresnel zone plate |
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Authors: | Zhenrong ZHENG Xütao SUN Peifu GU Xü LIU |
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Affiliation: | State Key Laboratory of Modern Optical Instrumentation, Zhejiang University, Hangzhou 310027, China |
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Abstract: | An objective lens composed of a spherical Fresnel zone plate mirror and aspheric mirrors is designed.The Fresnel zone plate with a spherical shape is analyzed, and the method to approximately replace the aspherical mirror with spherical Fresnel zone plate is deduced. The objective lens is designed with a single spherical Fresnel zone plate mirror and three aspherical mirrors. Under the condition of 100 × magnification,2.5 Fresnel number and 120° field angle, the modulation transfer function can reach above 40% at 0.6 line pairs/mm on the magnification side, and the distortion is less than 2.2%. This method can provide a reference for the application of Fresnel zone plate in visible light imaging, and has a bright future with the continuous development of the fabrication technique of Fresnel devices. |
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Keywords: | optical design spherical Fresnel zone plate objective lens reflection |
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