复合薄膜衍射透镜制备及耐空间辐照性能研究

Preparation and Space Irradiation Resistance of Composite Thin Film Diffractive Lens

薄膜衍射透镜是空间轻量化成像领域的一个重要发展方向。高性能聚酰亚胺薄膜材料由于其良好的综合性能得到广泛应用,但较差的可见光透过率以及空间环境下性能不稳定性限制了其在空间薄膜光学镜基底材料领域的发展。通过溶胶-凝胶提拉法在菲涅耳衍射透镜表面制备了二氧化硅增透膜,这种复合结构设计一方面提高了聚酰亚胺薄膜的可见光透过性,另一方面通过表面二氧化硅薄膜提高了其对空间环境辐照的耐受性,本研究可为后期空间光学薄膜衍射透镜设计及制备提供参考。

Thin film diffractive lens is an important development direction in space lightweight imaging.Highperformance polyimide film materials are widely used because of their good comprehensive properties,but their low visible light transmittance and unstable performance in space environments limit their development in the field of substrates for space thin film optical mirrors.In this paper,SiO_(2) antireflection film was prepared on the surface of the Fresnel diffraction lens by the sol-gel dip-pulling method.This composite structure design improves the visible light transmittance of polyimide film on the one hand,and improves its radiation resistance to space environment through surface silicon dioxide film on the other hand.This study provides a reference for the design and fabrication of space optical thin film diffraction lenses.