光致聚合物全息光栅曝光特性的研究

Exposure characteristics of photopolymer holographic gratings

为了研究采用由曙红做染料、丙烯酰胺和亚甲基双丙烯酰胺构成的光致聚合物制成的全息透射光栅的曝光特性,用实验的方法探索了光栅空间频率、曝光强度、曝光时间等因素对该透射光栅衍射效率的影响。实验表明,聚合物全息透射光栅空间频率,曝光强度,曝光时间都有一个互相关联的最佳范围,在这一范围内衍射效率能达到最大值。当聚合物光栅在空间频率为2751 line/mm附近,曝光强度在12mW^15mW之间,曝光量在770m J/cm2左右时,衍射效率最大。最大衍射效率能达到75%左右,在全息光栅中衍射效率较高。

The holograhic transmission grating is recorded in the photopolymer,which is composed of the acrylamide radical monomers and sensitized by yellowish erosion. The effect of such factors as spatial frequency, exposure intensity and time on gratings＇ diffraction efficiency is studied with experimental method. The experimental results show that the grating spatial frequency,the exposure intensity and time have a preferable and related range where the diffraction efficiency could arrive at the maximum. When the grating＇ s spatial frequency is near 2751 line/mm,the exposure intensity is between 12mW and 15mW and the exposure energy is 770mJ/cm^2, the diffraction efficiency arrives at the maximum. The maximun diffaction efficiency is about 75% ,higher than some other holograhic gratings.