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用相位掩模法制造光纤光栅是一种简单、有效的方法 .本文用标量衍射理论对相位掩模的近场衍射特性进行了分析 ,讨论了各级衍射光形成的干涉条纹的分布情况 ,得到了一些有益于光纤光栅制造的结论和有用公式
The phase mask method for fabricating fiber gratings is a simple and effective method.Based on the scalar diffraction theory, the near-field diffraction characteristics of the phase mask are analyzed and the distribution of the interference fringes formed by the diffracted light of each stage is discussed. Some conclusions and useful formulas that benefit the fabrication of fiber gratings