高斯光束下的双缝衍射

Double-slit Diffraction of Gaussian Beam

依据基尔霍夫衍射理论,利用幂级数展开的方法推导出旁轴条件下高斯光束双缝衍射的近似光强计算公式,并通过数值计算对双缝衍射的基本特性进行了讨论,得出了与其他文献一致的结论,得出了高斯光束下的双缝衍射极小值点比平行光束双缝衍射的极小值点向外移,观察屏中心光能变小;光强分布可由激光斑在衍射屏处的参数调制的结论.

Based on Kirchhoffs theory, the approximate intensity formulas of double - slit diffraction of Gaussian Beam is derived under paraxial approximation with power series expansion methods. The fundamental characteristics of the double - slit diffraction filed are analyzed by the numerical calculated and some results consistent, with other literature are obtained.