Flores Angel, Wang Michael R, Yang Jame J
Department of Electrical and Computer Engineering, University of Miami, Room 406, 1251 Memorial Drive, Coral Gables, Florida 33146, USA.
Appl Opt. 2004 Oct 20;43(30):5618-30. doi: 10.1364/ao.43.005618.
A method for designing achromatic hybrid refractive-diffractive elements that can produce beams with long focal depths while they preserve the entire aperture for capture of light and high transverse resolution is presented. Its working principle is based on the combination of a diffractive optical element that generates a long range of pseudonondiffractive rays and a refractive lens of opposite dispersion to form an achromatic hybrid lens. A hybrid lens with a fast f-number (f/1) that works in the entire visible wave band (400-700 nm) was designed and fabricated. Simulation results demonstrate a factor-of-10 improvement in depth of focus compared with that of a conventional f/1 lens, with matching 1-microm lateral resolution. Experimental results confirm the effectiveness of the proposed method through demonstration of an achromatic hybrid lens with better than a factor-of-7 improvement in depth of focus and 1-microm transverse resolution.
提出了一种设计消色差混合折射-衍射元件的方法，该元件能够产生具有长焦深的光束，同时保留整个孔径以捕获光并具有高横向分辨率。其工作原理基于产生长范围伪非衍射光线的衍射光学元件与具有相反色散的折射透镜相结合，以形成消色差混合透镜。设计并制造了一种在整个可见波段（400-700nm）工作的快速f数（f/1）混合透镜。模拟结果表明，与传统f/1透镜相比，焦深提高了10倍，横向分辨率匹配为1微米。实验结果通过展示一种消色差混合透镜证实了该方法的有效性，该透镜的焦深提高了7倍以上，横向分辨率为1微米。
