Centimeter-Sized Aplanatic Hybrid Diffractive-Refractive Lens

The design and the fabrication of a hybrid diffractive-refractive lens (HDRL) by the femtosecond laser direct writing technique at 343-nm wavelength are demonstrated. The diffractive part is a 10-mm-diameter aplanatic element inside a Z-cut sapphire wafer. The refractive part is a spherical planocon...

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Bibliographic Details
Published in:IEEE photonics technology letters 2019-01, Vol.31 (1), p.3-6
Main Authors: Hua, Jian-Guan, Hu, Zhi-Yong, Xu, Si-Jia, Tian, Zhen-Nan, Yu, Yan-Hao, Chen, Qi-Dai, Sun, Hong-Bo
Format: Article
Language:English
Subjects:
Aplanatism
Cameras
Direct laser writing
Femtosecond laser
hybrid diffractive-refractive lens
Image resolution
imaging resolution
Integrated optics
Lenses
Modulation transfer function
Optical device fabrication
Optical diffraction
Optical imaging
Optical reflection
Optical refraction
Optical variables control
Product design
Radius of curvature
Refractive lenses
Sapphire
Thermal stability
Weight
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Summary:The design and the fabrication of a hybrid diffractive-refractive lens (HDRL) by the femtosecond laser direct writing technique at 343-nm wavelength are demonstrated. The diffractive part is a 10-mm-diameter aplanatic element inside a Z-cut sapphire wafer. The refractive part is a spherical planoconvex lens with a 9.3-mm radius of curvature. These two parts are jointly combined to constitute a diffractive-refractive singlet. The hybrid singlet realizes aplanatic action for the aspherical lens, which reduces the focal spot size of the spherical lens by 1/4. The modulation transfer function of the hybrid singlet shows a better imaging resolution performance than that of the single spherical lens. The diffractive elements inside the spherical lens also were made and not only further improve thermal stability of the optical system but also reduce the volume and weight. This HDRL can find important applications in diffractive reflective hybrid optics, super-resolution imaging, and integrated optics.
ISSN:1041-1135
1941-0174
DOI:10.1109/LPT.2018.2880013