A method for reducing surface electric field of graded-index reflective coating
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摘要: 为了解决渐变折射率反射膜表面电场不为0,容易造成表面损伤的问题,提出了反射相移补偿方法,即不引入另外界面,在渐变折射率反射膜表面增加一层适当厚度的均匀膜,来降低渐变折射率反射膜的表面电场。结果表明,该方法确实降低了渐变折射率反射膜的表面电场;缺点是导致了渐变折射率反射膜中心波长的略微漂移,但该漂移相比于反射带宽而言可以忽略。该研究对制备高损伤阈值的渐变折射率反射膜具有参考价值。Abstract: Considering graded-index reflective coating with high surface electric field and low surface damage threshold,a compensation process of reflection-induced retardance is applied for reducing the surface electric field of graded-index reflective coating.To achieve this compensation,without generating another interface,a uniform thin layer should be added on the surface of graded-index reflectance coating.This method obviously reduces the surface electric field.But it makes the central wavelength of reflective coating appreciably drift.However,comparing to reflectance bandwidth,this drift is so little that it can be ignored.This study will play an important role in designing graded-index reflectance coating with high damage threshold.
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