利用涡旋光束与锥透镜透射率函数设计相位掩模板，采用平面光照射写入相位掩模板的空间光调制器(SLM)，则在SLM的傅里叶平面上产生了完美涡旋光束，解决了傅里叶平面0级和±1级光谱重叠的问题。提出了一种完美涡旋光束的空间自由调控技术，通过实验分析，明确了空间调控位移与调控因子间的函数关系，调控精度达到了2.25 μm。通过在线调节锥透镜的锥角参数，实现了完美涡旋光束中心亮环半径的自由调控，并得到光束中心亮环半径与锥角的二次函数关系。将波长为532 nm和632.8 nm入射光产生的完美涡旋光束作对比，结果表明，当入射波长较长时，仍可得到较小半径的完美涡旋光束。该研究为完美涡旋光束在微粒操纵、光学信息编码、光学测量及基于轨道角动量的光纤通信等领域的应用提供了新思路。

A phase mask is designed by vortex beams and the transmissivity function of an axicon, and the plane wave is irradiated to the spatial light modulator (SLM) into which the phase mask is written. The perfect vortex beams are generated on the Fourier plane of SLM, and then the overlap between the 0 order and the ±1 order spectra on the Fourier plane is solved. A space free-control technology for perfect vortex beams is proposed. By analyzing the experimental data, the functional relationship between the spatial displacement and the adjustable factor is determined, and the control precision achieves 2.25 μm. Furthermore, by adjusting cone angle parameters of the axicon in situ, the center bright ring radius of the perfect vortex beam could be controlled freely. The quadratic functional relationship between the radius of the center bright ring and the cone angle is obtained. The perfect vortex beams, which are generated by the incident lights with wavelengths of 532 nm and 632.8 nm, are compared. Results show that the perfect vortex beam with a smaller radius can also be obtained by a longer wavelength incidence. The study is expected to inspire new applications of the perfect vortex beams in micro-particle manipulation, optical information coding, optical measurement, fiber communication based on orbital angular momentum.