In a recent publication [Appl. Opt.57, 8087 (2018).] a zoom system based on rotating toroidal lenses had been theoretically suggested. Here we demonstrate two different experimental realizations of such a system. The first consists of a set of four individually rotatable cylindrical lenses, and the second of four rotatable diffractive optical elements with phase structures corresponding to "saddle-lenses". It turns out that image aberrations produced by the refractive zoom system are considerably reduced by the diffractive system.

中文翻译：

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变焦系统通过旋转环形透镜实现。

在最近的出版物中[Appl。Opt.57，8087（2018）。]理论上提出了基于旋转环形透镜的变焦系统。在这里，我们演示了这种系统的两种不同的实验实现。第一个由一组四个可单独旋转的圆柱透镜组成，第二个由四个可旋转衍射光学元件组成，它们的相位结构对应于“鞍形透镜”。事实证明，由衍射变焦系统大大减小了由折射变焦系统产生的像差。