By using derived expressions,the influence of fractional order on transform properties of this kind of beam at the FRFT plane are investigated and illustrated with numerical calculations.

• 由此表达式；研究在分数傅里叶变换面上分数阶数对此种光束变换属性的影响并且给出数值计算例.；所得表达式提供了一种研究二维余弦高斯光束的分数傅里叶变换的方便工具