零相关位相板准远场应用的数值研究

对零相关位相板匀滑准远场散斑的特性进行了数值模拟，并与使用随机位相板(配合二单元 偏振控制板)的情形进行了比较.结果表明，尽管零相关位相板是针对入射场为平面波和作为 远场应用而设计的，但在准远场应用中，当离焦距离不超过0002355λf²/d2，入射场的振幅随机起伏不超过10%和位相随机起伏不超过λ/2０的情况下，其 散斑的光强起伏仍明显低于采用随机位相板的情形.因而，零相关位相板在准远场应用中仍 能有效地匀滑散斑. 关键词： 零相关位相板 准远场散斑匀滑 激光聚变

NUMERICAL INVESTIGATION OF QUASI-FAR-FIELD APPLICATION OF ZERO-CORRELATION PHASE PLATE

The characteristics of smoothing quasi-far-field speckles using a zero-correlati on phase plate are simulated numerically in general cases.A comparison between t he speckles with a zero-correlation phase plate and those with a random phase pl ate (in combination with a two-element polarization control plate) is given.The zero-correlation phase plates are designed for the perfect near-field irradiatio n and the far-field application.However,the results show that the quasi-far-fiel d speckle intensity modulations using a zero-correlation phase plate are much sm aller than those with a random phase plate under the case of defocus distance le ss than 0.002355λf²/d² and the incident field with random variations of amplitude (≤10%) and phase (≤λ/20).Therefore,the zero-correlat ion phase plates can still smooth quasi-far-field speckles effectively.