Although holographic projection is still gaining its momentum, it will most likely be realized as short-throw projection on highly tilted screens. This will require the depth of focus significantly larger than the native one coming from the f-number of the optical setup. Here we present a simple and lossless method of extending the depth of focus by a modified holographic encoding comprising virtual optical elements, allowing sharp imaging on a screen tilted by 56°. Numerical simulations and experimental validations on a spatial light modulator are given. The experiment proved the increase of field depth which barely compromises the image quality and its brightness.

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尽管全息投影仍在蓄势待发，但它很可能会在高度倾斜的屏幕上实现短焦投影。这将需要比来自光学设置的 f 数的原始焦深大得多的焦深。在这里，我们提出了一种简单且无损的方法，通过包含虚拟光学元件的改进型全息编码来扩展焦深，从而在倾斜 56° 的屏幕上实现清晰成像。给出了空间光调制器的数值模拟和实验验证。实验证明，景深的增加几乎不影响图像质量和亮度。

© 2021 美国光学学会根据 OSA 开放获取出版协议的条款