为进一步研究涡旋光,推动涡旋光在通信和医学等方面的应用,需要产生稳定的各阶厄米-高斯(HG)光束。现通过对大数值孔径外腔式HeNe激光器进行结构微调,并采取自激励的方法直接产生各种高阶HG光束。此方法操作简单,激光模式稳定,同时利用MATLAB计算出对应的高阶HG光束模式的横向光强分布。实验结果和理论计算结果基本一致,该研究为今后气体激光器的模式控制和分析奠定了一定的实验基础,得到的高阶HG光束可以用于稳定涡旋光的产生。

In order to further study the vortex light and promote its applications in such areas as communications medical applications and other aspects, it is required to produce stable highorder HermiteGaussian (HG) beams. A simple method without the help of external conditions is designed to excite all highorder HermiteGaussian modes in high numerical aperture HeNe external cavity laser by finetuning the structure of the laser. The operation is simple, stable and the beam patterns are very clear. They are analyzed and compared with the corresponding MATLAB computer simulations, and the experimental results and theoretical speculation are basically the same. The experimental results lay a foundation for the future of gas laser mode control and analysis, and the highorder HermiteGaussian modes can be used to generate stable Vortex light.