Moothanchery Mohesh, Naydenova Izabela, Toal Vincent
Centre for Industrial & Engineering Optics, School of Physics, Dublin Institute of Technology, Dublin, Ireland.
Opt Express. 2011 Jul 4;19(14):13395-404. doi: 10.1364/OE.19.013395.
We study the shrinkage in acrylamide based photopolymer by measuring the Bragg detuning of transmission diffraction gratings recorded at different slant angles and at different intensities for a range of spatial frequencies. Transmission diffraction gratings of spatial frequencies 500, 1000, 1500 and 2000 lines/mm were recorded in an acrylamide based photopolymer film having 60 ± 5 μm thickness. The grating thickness and the final slant angles were obtained from the angular Bragg selectivity curve and hence the shrinkage caused by holographic recording was calculated. The shrinkage of the material was evaluated for three different recording intensities 1, 5 and 10 mW/cm2 over a range of slant angles, while the total exposure energy was kept constant at 80 mJ/cm2. From the experimental results it can be seen that the shrinkage of the material is lower for recording with higher intensities and at lower spatial frequencies.
我们通过测量在一系列空间频率下，以不同倾斜角度和不同强度记录的透射衍射光栅的布拉格失谐，来研究基于丙烯酰胺的光聚合物中的收缩情况。在厚度为60±5μm的基于丙烯酰胺的光聚合物薄膜中记录了空间频率为500、1000、1500和2000线/毫米的透射衍射光栅。从角布拉格选择性曲线获得光栅厚度和最终倾斜角度，从而计算出全息记录引起的收缩。在一系列倾斜角度下，针对三种不同的记录强度1、5和10 mW/cm²评估材料的收缩情况，同时总曝光能量保持恒定在80 mJ/cm²。从实验结果可以看出，对于较高强度和较低空间频率的记录，材料的收缩较小。
