Wang Xuan, Hua Hong
Opt Express. 2021 Oct 11;29(21):33771-33784. doi: 10.1364/OE.439989.
This paper presents the optical design of a digitally switchable multi-focal microlens array which can be used to extend the depth of field in integral imaging systems. The proposed switchable multi-focal microlens array consists of a customized freeform multi-focal microlens array (MLA) and a programmable spatial light modulator. By switching among the different optical powers of the switchable multi-focal MLA, an integral imaging system can render or capture a 3D scene at a large depth range around several central depth planes. We demonstrate the design considerations for a dual-focal microlens array with a primary and secondary focal lengths of 4mm and 4.06mm, respectively. We further validated the design by providing both interferometric measurements of the surface profiles and image contrast and resolution tests of a manufactured MLA prototype.
本文介绍了一种数字可切换多焦点微透镜阵列的光学设计，该阵列可用于扩展积分成像系统的景深。所提出的可切换多焦点微透镜阵列由定制的自由曲面多焦点微透镜阵列（MLA）和可编程空间光调制器组成。通过在可切换多焦点MLA的不同光焦度之间切换，积分成像系统可以在围绕几个中心深度平面的大深度范围内渲染或捕获3D场景。我们展示了分别具有4mm和4.06mm主焦距和副焦距的双焦点微透镜阵列的设计考虑因素。我们通过提供表面轮廓的干涉测量以及制造的MLA原型的图像对比度和分辨率测试，进一步验证了该设计。
