高斯光束照射下的等倾双光束干涉

根据等倾干涉原理，对高斯光束经薄膜反射后的光强、可见度、条纹分布进行了理论分析，讨论了入射角对光强、可见度分布的影响，相位角对条纹可见度的影响.数值模拟计算表明：沿着垂直于光传播方向的平面，反射光束叠加区域为一圆斑，随着入射角的增大，可见度逐渐减小，光强分布偏离了高斯分布，光斑变大，峰值减小.干涉条纹在空间的分布类似于平面波的薄膜等倾干涉，主要由入射角及薄膜厚度决定.

Gaussian Double-beam Interference of Equal Inclination

Based on interference principle of equal inclination. The distribution of intensity, visibility and fringes were analysed theoreticall y,and the influence of incidence angle on the distribution of intensity and visi bility and of phase angle on the distribution of fringes by medium film reflecti on for a Gaussian beam discussed. Numerical calculation results show, on a plane vertical to the direction of light propagation, it is a circular spot for refle cted light in the region of super-position. With the increase of incidence angl e, the visibility reduced gradually, the reflected intensity deviated from Gauss ian distribution, the size of beam spot broadened, the peak value reduced. The d istribution of fringes by medium film reflection for a Gaussian beam in space is similar to that of a plane light,which is mainly decided by incidence angle and thickness of medium film.