摘要
利用平面波衍射的角谱理论 ,分析计算了二元相位光栅衍射光场的空间分布 ,特别讨论了离焦量和非单色光对泰伯像的影响 .随离焦量和带宽的增加 ,泰伯像的对比度和衍射效率减小 ,而压缩比增加 .计算结果指出 ,在带宽 <10 0 0或离焦量 <0 .0 1时 ,其对比度和衍射效率减小不到10 % ,仍能成较高质量的泰伯像 ;当带宽 >5 0 0 0或离焦量 >0 .1时 ,成像质量显著下降 .用薄膜沉积法制作了二元相位光栅 ,实验验证了理论结果 .这些结果对泰伯成像和阵列照明器的设计有重要的参考价值 .
The spatial distribution of Fresnel diffraction field of binary phase gratings is analyzed by using RSD theory. And the effects of defocus length and quasimonochromatic lines on Talbot image are especially studied. Both the contrast and the efficiency of diffraction decrease, and the ratio of compression rises as the increasing of defocus length δor band width bof quasimonochromatic line. The numerical results show that both of all reduce about less 10% when δ<0.01 or b<1000. Using the methods of film aggradation makes the binary phase grating. Experiment results are consistent with the theory results. These results are very useful for Talbot-imaging and the design of array illuminators.
出处
《光子学报》
EI
CAS
CSCD
北大核心
2003年第3期348-351,共4页
Acta Photonica Sinica
关键词
二元相位光栅
菲涅耳衍射
泰伯像
离焦量
非单色光
Binary phase grating
Fresnel diffraction
Talbot image
Defocus length
Quasimonochromatic line
