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基于空间光调制器利用Gerchberg-Saxton算法设计了一种衍射光学元件-轴锥透镜。首先,基于惠更斯-菲涅尔原理,利用G-S迭代算法设计出轴锥透镜的掩模相位图;然后,写入空间光调制器作为全息衍射体;最后,数值仿真和实验进行对比分析。结果显示:与实际轴锥透镜相比,设计的轴锥透镜衍射元件可产生性能相同的贝塞尔光束;并且验证了其具有可在线实时修改元件参数的优点。因此,该方法可应用于阵列化、集成化以及拥有复杂轮廓的光学元件设计领域。
Based on the spatial light modulator Gerdberg-Saxton algorithm is used to design a diffractive optical element - axicon lens. First, based on the Huygens-Fresnel principle, the mask phase diagram of the axicon lens is designed by the G-S iterative algorithm. Then, the spatial light modulator is written as a holographic diffractive body. Finally, the numerical simulation and experiments are compared and analyzed. The results show that the designed axicon lens diffractive element can produce the Bessel beam with the same performance compared with the actual axicon lens. And it has been verified that it has the advantage of modifying the element parameters online in real time. Therefore, the method can be applied to the field of array design, integration and optical element design with complex contours.