紧凑型横向变焦系统关键器件的设计方法与功能验证

变焦系统可实现连续的光学变焦，可对不同景深的目标实现连续成像。在焦深延拓和光学检测等领域具有广泛地应用和发展潜力。本文提出了一种紧凑型可实现连续变焦功能的扁平化位相衍射元件，并设计分析和验证了横向调制相位型变焦衍射元件的功能。通过标量衍射基本理论模型，借助菲涅尔波带和多台阶相位衍射元件的设计方法，实现了横向变焦关键器件的设计仿真和实验验证。并以多波长响应的空间光调制器为基础，搭建了器件相位调制验证实验系统，通过测试证明了所设计器件的变焦能力，仿真和实验测试均可实现5倍变焦目标的有效调制。

Design Method and Functional Verification of Key Components of Compact Lateral Zoom

The zoom system can achieve continuous optical zoom, and achieve continuous imaging of targets with different depths of field. It has wide application and development potential in the fields of focal depth extension and optical inspection. This paper proposes a compact and flat phase diffractive element that can realize continuous focusing function, and design, analyze and verify this kind of phase-type zoom diffractive element that can realize lateral modulation. Through the basic theoretical model of scalar diffraction and the design method of Fresnel band and multi-step phase diffractive element, the simulation and experimental verification of key components of lateral zoom are realized. And based on the multi-wavelength response spatial light modulator, the device phase modulation verification experimental system was built that prove the modulation capability. The results of the experimental simulation tests show that the key components can achieve effective modulation of the lateral zoom, and the zoom ratio can reach the designed 5 times zoom target.