提出通过单个空间光调制器制备厄米高斯(HG)光束的方法,理论上分析了输入光束空间横向分布与模式转换效率的关系,实验上采用最佳的椭圆形光斑入射,获得了高质量的HG6,0、HG8,0、HG10,0模光场,纯度分别为96.2%,94.9%,93.4%,并且HG10,0模的转换效率达到了14.45%,输出功率为217 mW,其转换效率较传统的基模高斯光束入射时提高了5.6倍。此高质量及高效的高阶厄米高斯光束制备方法,有望应用于高阶空间压缩态光场制备和空间小位移精密测量等方面。

Herein, the generation of Hermite-Gaussian beams using a spatial light modulator was experimentally investigated and the relation between mode conversion efficiency and transverse distribution of the input beam was theoretically analyzed. High-quality Hermit-Gaussian beams with HG6,0, HG8,0, and HG10,0 modes, whose purity was 96.2%, 94.9%, and 93.4%, respectively, were experimentally generated using the optimum input beam with an elliptical transverse distribution. Moreover, the 217-mW HG10,0 mode was obtained and the mode conversion efficiency reached 14.45%, which is 5.6 times higher than that of the traditional input beam with fundamental Gaussian mode. The generation method of Hermite-Gaussian beam with high quality and efficiency has promising application potentials in the precision measurement of small displacement and preparation of a high-order spatial squeezed light field.