CAJ | 학술논문

根据光致聚合物记录机理,研究了不同记录方式对光栅衍射效率的影响.对已有的光致聚合物光栅形成的一阶扩散模型进行简化,求解出全息曝光、暗增长、均匀后曝光过程对应的折射率调制度的解析式.应用所得解析结果,对三种记录方式在不同光强下的折射率调制度动态进行数值模拟.采用蓝敏光致聚合物,分别在4 mW/cm~2和2 mW/cm~2光强下应用不同方式记录光栅,结果表明:如果曝光光强较高,暗增长的记录方式将获得相对高的饱和折射率调制度,而均匀后曝光会加速达到饱和的进程.
근거광치취합물기록궤리,연구료불동기록방식대광책연사효솔적영향.대이유적광치취합물광책형성적일계확산모형진행간화,구해출전식폭광、암증장、균균후폭광과정대응적절사솔조제도적해석식.응용소득해석결과,대삼충기록방식재불동광강하적절사솔조제도동태진행수치모의.채용람민광치취합물,분별재4 mW/cm~2화2 mW/cm~2광강하응용불동방식기록광책,결과표명:여과폭광광강교고,암증장적기록방식장획득상대고적포화절사솔조제도,이균균후폭광회가속체도포화적진정.
Based on the recording mechanism of photopolymer,the effect of different recording modes on the diffraction efficiency of gratings was investigated.The existing first-harmonic diffusion model of grating formation in photopolymer was simplified,then the analytic expressions of refractive index modulation for holographic exposure,dark enhancement and uniform post-exposure were educed.The kinetics of refractive index modulation for these three recording modes under different exposure intensities were numerically simulated by using the analytic expressions.Experiments were done in a new blue-sensitized photopolymer material.The gratings were recorded by different recording modes with exposure intensities of 4 mW/cm~2 and 2 mW/cm~2 respectively.The results showed that if the intensity was high,the dark enhancement mode yielded to a high saturated refractive index modulation,while uniform post-exposure made the course of saturation fast.