Zhang Fang, Zhu Jing, Song Qiang, Yue Weirui, Liu Jingdan, Wang Jian, Situ Guohai, Huang Huijie
Appl Opt. 2015 Oct 20;54(30):8891-8. doi: 10.1364/AO.54.008891.
In general, Fourier transform lenses are considered as ideal in the design algorithms of diffractive optical elements (DOEs). However, the inherent aberrations of a real Fourier transform lens disturb the far field pattern. The difference between the generated pattern and the expected design will impact the system performance. Therefore, a method for modifying the Fourier spectrum of DOEs without introducing other optical elements to reduce the aberration effect of the Fourier transform lens is proposed. By applying this method, beam shaping performance is improved markedly for the optical system with a real Fourier transform lens. The experiments carried out with a commercial Fourier transform lens give evidence for this method. The method is capable of reducing the system complexity as well as improving its performance.
一般来说，在衍射光学元件（DOE）的设计算法中，傅里叶变换透镜被认为是理想的。然而，实际傅里叶变换透镜的固有像差会干扰远场图案。生成的图案与预期设计之间的差异会影响系统性能。因此，提出了一种在不引入其他光学元件的情况下修改DOE傅里叶频谱以降低傅里叶变换透镜像差影响的方法。通过应用该方法，对于具有实际傅里叶变换透镜的光学系统，光束整形性能得到了显著提高。使用商用傅里叶变换透镜进行的实验证明了该方法的有效性。该方法能够降低系统复杂性并提高其性能。
