Cakmakci Ozan, Qin Yi, Bosel Peter, Wetzstein Gordon
Opt Express. 2021 Oct 25;29(22):35206-35215. doi: 10.1364/OE.439585.
Holographic pancake optics have been designed and fabricated in eyewear display optics literature dating back to 1985, however, a see-through pancake optic solution has not been demonstrated to date. The key contribution here is the first full-color volume holographic pancake optic in an optical see-through configuration for applications in mobile augmented reality. Specifically, the full-color volume holographic pancake is combined with a flat lightguide in order to achieve the optical see-through property. The fabricated hardware optics has a measured field of view of 29 degrees (horizontal) by 12 degrees (vertical) and a measured large eyebox that allows a ±10 mm horizontal motion and ∼±3 mm vertical motion for a 4 mm diameter pupil. The measured modulation transfer function (average orientation) is 10% contrast at 10 lp/deg. Three holograms were characterized with respect to their diffraction efficiency, angular bandwidth, focal length, haze, and thickness parameters. The phase function in the reflection mode hologram implements a spherical mirror that has a relatively simple recording geometry.
全息薄饼光学元件早在1985年的眼镜显示光学文献中就已被设计和制造出来，然而，迄今为止尚未展示出一种透视式薄饼光学解决方案。这里的关键贡献是首个用于移动增强现实应用的光学透视配置中的全彩色体全息薄饼光学元件。具体而言，全彩色体全息薄饼与平面光波导相结合，以实现光学透视特性。制造的硬件光学元件测得的视场为水平29度乘垂直12度，并且测得的大视场光阑允许直径4毫米的瞳孔进行水平±10毫米和垂直约±3毫米的移动。测得的调制传递函数（平均取向）在10 lp/deg时对比度为10%。对三个全息图的衍射效率、角带宽、焦距、雾度和厚度参数进行了表征。反射模式全息图中的相位函数实现了一个具有相对简单记录几何形状的球面镜。
