多光束非定域干涉反射光强分布

Reflex Light Intensity Distribution in Multiple-beam Nonlalocalized Interferometer

研究了多光束非定域干涉现象,得到了多光束非定域干涉的反射光强分布函数.数值计算结果表明:随着镜面反射系数的增加,多光束非定域干涉条纹半值宽度降低,条纹变得更加锐细,光谱分辨率提高;当镜面反射率较高时,除了暗条纹外,在低干涉级次处紧邻暗条纹还有很窄的亮条纹存在;亮条纹振幅逐渐衰减至背景光强度,干涉级次越低亮条纹振荡越明显;第一束反射光提供了一个均匀的背景,第二束反射光的加入产生了双光束干涉,干涉条纹较粗,对比度较低,更多光束的加入使干涉暗条纹变得锐细,在相邻暗条纹间出现了明暗相间的低强度明暗条纹;足够多光束的加入使相邻暗条纹间低强度变化的明暗条纹消失,同时在紧邻暗条纹处出现了振幅振荡衰减的亮条纹.最后,将多光束非定域干涉理论应用于光学滤波器的研究,结果表明:提高镜面反射率,可以显著降低多光束非定域干涉的滤波带宽;改变镜面间距,可以灵活调整多光束干涉仪滤波波长和相消波长间距.

Abstract：The nonlacalized interference in multiple-beam interferometer was studied. The reflex llglat intensity distribution function was obtained. The numerical analysis shows that as the reflection coefficient of specular surface increase, the stripe of the nonlocalized interference becomes sharp, resolution ratio is improved, while the half-value width decreases; narrow bright stripe nearby the dark stripe exists at low interference order with higher reflection coefficient of specular surface; the amplitude of the bright stripe gradually decreases to the background intensity; the oscillation becomes more obviously at lower interference order; the first reflex light provides an uniformity background, and the second reflex light makes a double beam interferes with the first reflex light; with the introduce of more reflex lights, the dark stripe becomes sharp and many low intensity interference stripes appear between neighbour dark stripes; the low intensity interference stripes between the dark stripes disappear and narrow bright stripes nearby the dark stripes arise while with sufficient reflection lights. At last, the filter based on the multiple beam nonlocalized interference theory was investigated. The filtering bandwidth of the nonlocalized interferometer can be reduced notably by increasing the reflection coefficient of specular surface. While changing the mirror spacing, the filtering wavelength and the interval can be adjusted flexibly.