Abstract
We show the design and fabrication of high diffraction efficiency, optically recorded gradient-index Fresnel lenses in a two-stage photopolymer. A design analysis reveals that lens is limited by the material refractive index contrast, motivating use of recent high-contrast polymers. The number of pixels required for the optical exposure is typically well beyond available spatial light-modulator resolutions, motivating the use of a photolithographic mask. We use a dithered binary chrome mask with pixels of 2.5 μm diameter to write lenses up to 23 mm in diameter. Lenses down to with 76% diffraction efficiency and with 83% diffraction efficiency are demonstrated.
© 2019 Optical Society of America
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